How expansion valve auto AC works? (Suits you)

  • The air conditioning expansion valve, which is better known as the Car AC expansion valve, is a component of the car air conditioning system that is found inside virtually every automobile. As you may know, refrigerant liquid circulates within the system and flows to the evaporator where it transforms into cool vapor.

How do I know if my AC expansion valve is bad?

Symptoms of a bad expansion valve

  1. Car AC system isn’t cooling enough or won’t cool at all.
  2. High side pressure is high.
  3. Air coming from vents is frosty.
  4. AC blows cold, then hot.
  5. AC kicks on and then immediately kicks off.
  6. Airflow drops dramatically from vents.

What happens when an AC expansion valve goes bad?

You will notice when the A/C expansion valve goes bad because your air conditioning system will ultimately stop functioning properly. It will either produce less cool air or it won’t produce any cool air at all.

How do you test an AC expansion valve?

How to Test an AC Expansion Valve

  1. Make sure the AC unit is plugged in or, if it is in an automobile, turn the vehicle on.
  2. Use the manual to locate the thermostatic expansion valve.
  3. Lift the sensing bulb from the suction bulb well.
  4. Hold the sensing bulb in your hands for two minutes or place it in warm water.

What happens when expansion valve sticks open?

If the expansion valve is stuck open or clogged, the AC system will not cool properly. A clogged valve will lead to too little refrigerant, increasing the pressure in the system and causing the AC compressor to overheat.

What happens if expansion valve is stuck closed?

When stuck closed, a higher than normal high side reading will be seen. Typically, this will be over 400 psi and climb until the high-pressure switch shuts down the system. Very low or very high readings on the high-side gauge indicate a faulty expansion valve.

How do expansion valves fail?

As the expansion valve operates under high pressures and is temperature sensitive, improper working conditions, as well as impurities inside the loop, can cause its deregulation and malfunction. If the expansion valve is stuck open or clogged, the AC system won’t cool properly.

How does expansion valve work?

The expansion valve removes pressure from the liquid refrigerant to allow expansion or change of state from a liquid to a vapor in the evaporator. Under a greatly reduced pressure the liquid refrigerant is at its coldest as it leaves the expansion valve and enters the evaporator.

Can a expansion valve be cleaned?

It is very difficult to determine if a Thermostat Expansion Valve is clean. Remember that an AC system MUST be clean for the compressor and other components to function properly. Any debris or contamination at the TXV can prevent proper flow of lubricating oil through the system and its return to the compressor.

Why do Txv valves fail?

Do TXVs Ever Fail They can fail internally but most often they fail because of a blocked inlet screen (if they have one), contaminants entering the valve, loss of charge from the power head, bulb location, and positioning issues and overheating of the valve.

What is a superheat in air conditioning?

Superheat occurs when you heat vapor above its boiling point. Let’s say that a refrigerant boils at 40 degrees Fahrenheit at a low pressure in the evaporator. Superheat is critical in HVAC because it ensures the liquid refrigerant is boiled off before it leaves the evaporator and heads to the compressor.

What causes high side AC pressure too high?

The main reasons your compressor will have simultaneously low head pressure and high suction pressure is due to: Bad or leaky compressor valves. Worn compressor piston rings. Leaky oil separator return line.

How do you unstick an AC expansion valve?

Even holding he bulb in your hand should provide enough heat to open the valve. Next, place the TXV bulb into cold water. This should cause the expansion valve to close reducing the amount of refrigerant to pass thought the TXV into the coil. Suction pressure should drop, and superheat should rise.

Can expansion valve leak?

Signs of Expansion Valve Trouble Valves that are attached improperly to the suction line can cause leaks and misinterpret pressure readings.

How do you test an electronic expansion valve?

Perform an “Closed Valve Test ” per Service Facts instructions. Remove the stepper motor from the EEV 15 seconds after jumping the pins. If the valve is closed and refrigerant continues to flow, then check valve is leaking. Use a pinch off tool and crimp the tubing between the check valve & EEV.

How expansion valve auto AC works

What should I do if the condenser fan does not come on when it should? To begin, turn on the air conditioning and open the hood with the engine running. Observe whether the condenser/radiator fan comes on after 5 minutes or when the car reaches normal operating temperature. Turn off the car and wait
30 minutes for things to cool down if the fan isn’t turning on as expected. If there is anything impeding the fan’s ability to turn, remove it. Examine the electrical connections to ensure they are secure.

What is an expansion valve?

Through the use of an expansion valve, the flow of refrigerant from the condenser into the evaporator is controlled. As the refrigerant absorbs heat from the cabin air, it changes state from liquid to gas. In addition to a distant sensing bulb, the expansion valve may also have an inbuilt sensing device (called an H block). A remote sensing bulb is seen in this figure. Copper tube filled with expanding gas connects the remote sensing bulb to the expansion valve, which in turn is connected to the power supply.

In response to increased heat detection by the detecting bulb, the gas in the bulb and capillary tube expands, forcing the diaphragm in the expansion valve to open, allowing more liquid refrigerant to enter the evaporator through the expansion valve.

What happens inside the evaporator?

Liquid refrigerant is sprayed into the evaporator by the compressor. The evaporator is cooled by hot cabin air flowing over it. In a similar way to how water boils on a stove and transforms into steam, the liquid refrigerant absorbs the heat generated by the cabin and causes it to boil, changing its state from liquid to gas. Because the cabin air flows past the evaporator, the heat necessary to transform the refrigerant from a liquid to a gas is provided by the refrigerant itself. Once the refrigerant transitions from its liquid condition to a gas state, it continues to absorb heat from the cabin air.

All expansion valve systems, as opposed to orifice tube systems, generate a certain amount of superheat as a result of the operation of the valves.

What the compressor does

Upon entering the compressor, the superheated gaseous refrigerant is compressed into a high-pressure gas and sent into the condenser where it cools.

The job of the condenser

The condenser performs three functions: 1) Remove the refrigerant from its superheated state. Extra heat generated during both the superheat phase in the evaporator and the compression cycle is removed. 2) Remove as much heat as possible from the gaseous refrigerant until it condenses back into a liquid. 3) Reduce the temperature of the refrigerant. Because it brings the temperature of the high-pressure liquid refrigerant closer to that of its evaporating temperature, this sub-cooling is a crucial step because it allows the refrigerant to change state more readily inside the evaporator.

The net refrigeration impact of the system is increased as a result of subcooling.

Temperature drop across the condenser

Condensers of the serpentine/parallel flow and tube and fin types are used by automobile manufacturers. The temperature difference between the condenser’s input and output temperatures may be used to determine the efficiency of the condenser’s operation. For a serpentine or parallel flow condenser in an expansion valve system, you should notice a 60°F — 80°F reduction in temperature, whereas you should see a 20°F — 50°F drop for a tube and fin condenser. If your readings do not indicate this, look for clogged fins, an inappropriate fan speed, or an internal obstruction in your system.

Rick Muscoplat is a professional musician.

Expansion valves for car air conditioning system

Driving assistance is the best in the world. 15Distribution Platforms are a type of platform that allows you to distribute your products. The expansion valve serves a variety of functions.

  • It regulates the pressure drop required for refrigerant evaporation and cold creation. It regulates the rate at which fluid flows through the evaporator. It regulates the temperature of the evaporator’s output (superheating)

In addition to being downstream of the receiver drier, the expansion valve also receives the refrigerant fluid in a 100 percent liquid form and after it has been filtered, as described above. When the expansion valve is opened, the pressure of the refrigerant fluid upstream of the evaporator decreases significantly. The fluid cools as a result of the reduction in pressure, and it is subsequently sprayed into the evaporator. When the evaporator is running, the expansion valve is constantly connected.

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Expansion Valves

A refrigerant expansion valve is a device that is used to regulate the flow of refrigerant in a refrigeration system. They aid in the transition from high-pressure liquid refrigerant in the condensing unit to lower-pressure gas refrigerant in the evaporator by making the transition more seamless. According to the definition, the word ‘low side’ refers to a component of a system that functions at low pressure, in this instance the evaporator. The term ‘high side’ refers to the part of a system that functions under high pressure, in this case the condenser, and is used to identify this component of the system.

These valves are also known as metering devices in some circles.

  • Thermostatic Exp. Valves
  • Capillary Tubes
  • Float Valves
  • Automatic Ex. Valves
  • Thermostatic Ex. Valves

Using a pressure-actuated diaphragm, the Automatic Expansion Valver controls the flow of refrigerant from the liquid line to the evaporator in a refrigeration system. It is responsible for maintaining consistent pressure in the evaporator. The disadvantage is that it is inefficient when the load fluctuates; as a result, this kind is not suited for use in air conditioning, where the load fluctuates significantly during operation of the unit. It is possible to regulate the flow of liquid refrigerant into the evaporator coil using a Thermostatic Expansion Valve (TECV).

  • This sort of metering device is able to perform well even when the load fluctuates, making it an excellent choice for use in air conditioning systems.
  • It is also referred to as a TXV, TEV, or TX valve in some circles.
  • To achieve adequate sensing, the bulb must be fastened down tightly on the coil.
  • Similarly, as the temperature of the evaporator decreases as a result of a decrease in the demand for cooling, the pressure in the bulb will decrease, forcing the spring to force the valve shut.
  • In this case, it is connected to the suction line.
  • This gadget is simple, does not have any moving parts, and has a longer life span than others.
  • Because it is less expensive than TXV, this metering device is commonly found in devices that are manufactured in large quantities, such as room or window air conditioners.
  • The Float Valve is activated by a float that is submerged in the liquid refrigerant and acts as a solenoid.
  • The low-side float is responsible for ensuring that the amount of liquid refrigerant in the evaporator remains consistent.
  • In the high-pressure side of the system, the high-side float is placed, and it is responsible for maintaining a constant amount of refrigerant in the condenser.
  • As a result, the refrigerant is forced to flow into the evaporator, where it is collected.

In response to the falling level of liquid in the float chamber, the valve opening will be closed, stopping the liquid from flowing into the evap chamber. An Affiliated Site Discover the functions of the suction line and liquid line filter driers, which are commonly found in larger HVAC systems.

Energy Saving TipsRefrigerantIAQMotorsHumidifierCooling LoadLeak DetectionHVAC ScholarshipsFilter DrierHVAC Contests3D PrintingAir FilterPumpsAHUHVAC ManufacturersAir Conditioner RatingsRadonSplit AC BrandsSmart ThermostatsDX System

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What You Need To Know About The A/C Expansion Valve

The air conditioning system in your vehicle is meant to keep you comfortable on every journey you take in your valued possession. In order to be a good automobile owner, it is important that you understand how the various components work, such as the air conditioning expansion valve. If you don’t, you might wind up having to deal with a lot of pricey auto repair bills. Let’s find out more about the expansion valves for air conditioning systems:

How does an A/C Expansion Valve Work?

An expansion valve is a device that is used to relieve pressure from a liquid refrigerant in an air conditioning system. When expansion is enabled, the refrigerant may be converted to vapor inside the evaporator, resulting in increased efficiency. Following that, an expansion valve is used to regulate the flow of refrigerant. Metering is another term used to describe this procedure. Inside a valve, there is a moving rod that may be moved upwards and downwards in both directions. According to its design, the rod is intended to maintain either an open or closed route within, so permitting or prohibiting the entry of refrigerant.

Understanding the Difference Between Expansion Valves and Orifice Tubes

It is referred to as an orifice when it depicts a hole with a defined size. In essence, an orifice tube is a plastic component that is equipped with a brass jet on one side and a mesh screen on the other. A precise calculation of the hole size must be performed to guarantee that the correct quantity of refrigerant is introduced into the evaporator chamber. A/C expansion valves, on the other hand, are comprised of moving components. Depending on the situation, the amount of refrigerant in the evaporator can be adjusted.

As a result of the freezing of the evaporator, the gaseous pressure in the tube will fall.

What are the Common A/C Expansion Valve Problems?

If the expansion valve malfunctions, you will notice that your air conditioning system is functioning strangely. Some of the signs and symptoms are as follows:

  • Warm air is being blown out of the A/C vents. Frost begins to accumulate on the vents or on the evaporator of the air conditioning system. The air conditioning compressor is continually operating.

To clarify more on the third symptom, it suggests that the expansion valve has become blocked and is unable to completely open. Even if the interior of the vehicle is already chilly, the compressor is compelled to continue pumping refrigerant into the A/C system. We propose that you take your car to an A/C professional in order to have it tested and fixed in any instance. The valves are frequently tucked away deep within the A/C system of your vehicle. It is not as simple as loading up on petrol to locate it.

Is Replacing an A/C Expansion Valve Difficult?

The degree of difficulty in enabling the replacement of an air conditioning expansion valve varies substantially depending on the brand, make, and year. It is possible that you may need to empty the system before to the operation and then recharge it afterwards. Providing you have the necessary air-conditioning tools, such as an evacuation pump, a manifold gauge set, and so on, it is feasible to complete a Do It Yourself project.

In many cases, these important items are packaged together in a handy packaging. You should visit vehicle repair businesses if this is the case rather than risk making matters worse on your own.

Top Rated in Automotive Replacement Expansion Valves & Parts & Helpful Customer Reviews

4.7 out of 5 based on 348 customer reviews Four- and five-star ratings account for 93% of the ratings. This kit provided me with things that my local autoparts store did not provide, such as the tool that has two sizes, one on each end, which I found useful. I was able to effectively replace the shraeder valves in my air conditioning system. I’m delighted to have a variety of extras to choose from. Jim R. contributed to this article. It’s a nice set. I have automobiles from three different manufacturers.

  • In terms of craftsmanship, Schrader valves are satisfactory.
  • Mini valves will not fit in the bore because it is too tiny.
  • It is not a good value for the money.
  • 4.6 out of 5 based on 127 customer reviews Four- and five-star ratings account for 86 percent of the ratings.
  • There appears to be a problem with the installation tool when using a tiny diameter valve.
  • To my luck, I was able to drill this out and remove the burs from the slot, allowing the tool to resume normal operation.
  • David Babinchak contributed to this report.

It was able to repair the A/C on my 2007 Honda Pilot.

Take note of the metal piece that is blocking the spring in the hole at the bottom.

I had to replace it.

There is a video on the website.

They are a fantastic fit.

It is a great fit for my Lexus RX350 from 2008.

Excellent customer service.

User feedback on Ahmed4.8 |

The perfect match for our community and country in 2011.

It’s a perfect fit.

Written by Selina Submitted by Jimmy Selena H.

You may also be interested in 4.6 out of 5 based on 60 customer reviews Ninety percent of the ratings are four- or five-star ratings.

DanEd55 has contributed to this article. Submitted by Pablo James Smith contributed to this article. 4.6 out of 5 based on 54 customer reviews Ninety-one percent of the ratings are four- or five-stars.

Pontiac Grand Prix GTP Comp G (2004 model year). On the high side, I was receiving 300 psi, and on the low, I was getting 50 psi. Using a manifold set leased from Autozone ($160 up front, but you get everything back when it’s returned), I verified the results. I replaced this component and my air conditioning is now totally freezing, it was a great fit and came with gaskets, I highly recommend it. Cassie wrote this article. Submitted by Jose Written by Rich Blassick 4.7 out of 5 based on 36 customer reviews Ninety-one percent of the ratings are four- or five-stars.

Submitted by Donnie 4.5 out of 5 stars based on 75 user reviews Four- and five-star ratings account for 93% of the ratings.

In my study on 4Runner forums, I discovered that Denso is the OEM part and that the expansion valve on 4Runner A/C systems is the most often failed component.

  • Exceptional product that was delivered fast and at the most competitive price available

The expansion valve on my 2000 Toyota 4Runner Limited was an exact match and replacement for the original (3.4L and 4WD). Overall, this is an excellent product that comes highly recommended. The price is significantly cheaper than the cost of purchasing the identical thing from a Toyota dealer! Delivery was prompt, and the package had thorough installation instructions. By aisand, for those who are replacing their DENSO is the original equipment manufacturer. Perfect fit, and it comes with four o rings, so you won’t have to go looking for replacements.

  1. By a vengeful burd 4.7 out of 5 based on 31 customer reviews Four- and five-star ratings account for 92 percent of the ratings.
  2. It is effective.
  3. The part is of high quality and comes at a reasonable price.
  4. I was able to resolve my A/C freezing issue.
  5. I’m not having any problems anymore.
  6. Med.
  7. I was expecting a little bit more quality from Denso, given that it was a Denso.

Aside from that, the air conditioning is excellent. Stephen Bates contributed to this article. 4.6 out of 5 based on 40 customer reviews Four- and five-star ratings account for 96% of the ratings.

Arrived quickly and functions flawlessly. The air conditioner is blowing at 49 degrees. It does not come with O-rings, so you will need to order a set. The sizes for the Nissan Sentra were not included in the universal O-ring kit. Goodflix has made use of this. By the time they are in their twenties, they are fifty. Natossia Hernandez contributed to this article. 4.5 out of 5 based on 59 customer reviews Four- and five-star ratings account for 87 percent of the ratings. According to the mechanic, it was a success.

  1. It took a bit for the temperature to drop below 32 degrees.
  2. It performs just as promised, and I have not had an issue in more than three years.
  3. Submitted by Rodney By shopper1014.8 |
  4. Installed this along with all of the other pieces, with the exception of the pipes and tubes, and it appears to be working perfectly so far.
  5. It’s a perfect fit for my 2004 Honda CRV EX.
  6. Back off the dust shield on the engine side of the firewall to allow the pipe intake block to expand properly.
  7. After three or four failed efforts at the local parts store, I was eventually successful here!

The exact fit and function Steve Ensz contributed to this article.

4.8 out of 5 based on 21 customer reviews The majority of the ratings are either 4-stars or 5-stars.

Excellent fit and high-quality materials The work of G J MBy Kenney W.

By Michael J.

4.8 out of 5 based on 21 customer reviews Four- and five-star ratings account for 89 percent of the ratings.

There have been no complaints from Submitted by PhilVine Submitted by Billgon Submitted by Louie 4.6 out of 5 based on 35 customer reviews Four- and five-star ratings account for 92 percent of the ratings.

For more than a year, I was without air conditioning.

On a daily basis, this was the case, and anytime it rained, the windows would fog up because I did not have an air conditioner to defog the glass. The first mechanic informed me that the compressor was failing. Haawkyle’s IBy

This expansion valve was used to replace a stuck expansion valve in my 1994 Toyota 4Runner (also fits 89-95 Toyota pickup). The Denso item that was pulled from the truck had the same part number as this one and was also original to the truck. I re-charged the air conditioning, and it is now ice cold. Written by Romy Aaron Boggs contributed to this article. 4.5 out of 5 based on 48 customer reviews Four- and five-star ratings account for 88 percent of the ratings. Submitted by an Amazon customer Submitted by Anu Begin I’ve owned it for two years and it would not open when the temperature reached 101 degrees.

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Car AC Lines Freezing Up? Here’s What You Can Do About It

Air conditioning (AC) in your automobile is essential for your comfort and safety when the weather gets hot and humid, or really any time you want cold, dry air while you’re on the road. Unfortunately, frozen air conditioning pipes may cause serious disruptions to your car vacation. What causes your car’s air conditioning lines to freeze, and what can you do to prevent this from happening? Most of the time, air conditioning is one of those neglected systems that you don’t really think about until it stops operating properly.

If, on the other hand, your vehicle has been in an accident, has ever had any AC components removed, or has ever had any work performed, the condition is perfect for frozen AC lines to occur.

What Causes Car AC Lines to Freeze Up?

The only things that should be in your car’s air conditioning system are refrigerant and oil, and that’s about it. Pipes, hoses, and seals are carefully constructed to maintain a tight seal in order to keep these items inside and others — such as air, moisture, and dirt — outside. The moisture that has been injected into the system is the source of the problem of automobile air conditioning lines freezing up. It is at this point that the liquid refrigerant rapidly expands into a gas, causing the temperature to drop.

  • You may notice that warm air is flowing out of the vents if there is moisture in the system that has frozen.
  • You will receive chilly air again when the valve heats up and the ice melts and the refrigerant flows, but the cycle will continue as long as the valve is heated.
  • If there is a leak, air and moisture might be drawn into the system by the vacuum on the low side of the system, causing it to malfunction.
  • It is possible that a little amount of moisture will enter the can when you open the valve cap and insert the can if you use an R-134a top-off bottle to fill it.

Normally, part of this moisture is absorbed by the receiver-dryer, but it only has a limited capacity before being saturated, allowing the remainder to float around in the refrigerant stream as it cools.

What Can You Do About Moisture in the System?

If you discover that your car’s air conditioning lines are freezing up, you must first eliminate the moisture that is causing the problem, which begins with a thorough leak check. Make any necessary repairs to parts such as O-rings, hoses, lines, and evaporators, as well as recover any refrigerant that has leaked from the system. It is definitely necessary to replace the receiver-dryer if the system has been opened for more than a few hours due to an accident, damage, or corrosion. When exposed to the air, it has the potential to get saturated.

Evacuate the air conditioning system for around 30 minutes in order to boil off any moisture that may have accumulated in the lines.

Check out all of the air conditioning system components that are available on NAPA Online or bring your vehicle to one of our 17,000 NAPA AutoCare facilities for routine maintenance and repairs.

The image is from of Pic Basement.

Benjamin JerewView All

Ben has been taking things apart and putting them back together since he was five, and he has been putting them back together since he was eight. With the Automobile Repair program at the Central Georgia Community College, he discovered his true passion after dabbling in do-it-yourself repairs at home and on the farm. Ben felt he needed a change after holding his ASE CMAT certification for ten years. He now writes about automotive themes for websites and publications all over the world, covering topics such as new automotive technology, transportation regulations, pollution, fuel efficiency, and vehicle maintenance, among others.

What is an Aircon Expansion Valve and How Does it Work?

The air conditioner is a strong piece of equipment that can provide optimal cooling for any workplace or residence. Because everyone relies on their air conditioner to keep them cool and comfortable throughout the day, these machines must be maintained in excellent condition both internally and externally at all times. The air conditioning system is dependent on several components in order to continue providing families and businesses with the best possible cooling and ventilation throughout the year.

Each component, from the compressor to the filters to the coils, is critical in ensuring that the air conditioning unit operates at peak performance.

Expansion valves are devices that are used to control the flow of refrigerant in a refrigeration system and are considered to be one of the most vital and critical components of an air conditioner.

In this post, we will go over in depth the functions of an expansion valve, the many types of expansion valves, and how they all work together to make the air conditioning unit run.

How Does An Aircon Expansion Valve Work?

The fundamental understanding of the direct link between temperature and pressure is required before you can better appreciate how an air conditioning expansion valve works. In conjunction with an increase in refrigerant pressure, the temperature rises as well. As a result, the molecules of both elements become more closely packed together as a result of this. Once the refrigerant has passed through the compressor, it causes an increase in both of these components. The link between pressure and temperature is also inversely proportional to its direction of travel.

If you want to put it another way, when the pressure of the refrigerant is lowered, the refrigerant may also be efficiently cooled off.

If the expansion valve is not there, there is a significant risk that the refrigerant will flow and rush into the evaporator coil without any drop in pressure.

As the refrigerant finds its way into the system, it is only able to spread itself out in the evaporator coil that is now empty.

The Different Types of of an Expansion Valve

  1. A pressure-actuated diaphragm regulates the refrigerant flow from the liquid line down to the evaporator in an automatic expansion valve. This type of expansion valve is often seen in commercial refrigeration systems. A common downside is that it is counterproductive when the load fluctuates, which is the case in most cases. Because the load is likely to change significantly, it is strongly advised that this kind not be utilized in air conditioners.
  1. Expansion valve, also known as a thermostatic expansion valve (TEV), is a type of valve that regulates the flow of liquid refrigerant into an evaporator coil by using a valve mechanism. Following that, the evaporator regulates the flow by controlling the pressure in the system. This sort of device performs effectively even when subjected to a variety of various types of variations, making it an excellent choice for an air conditioning system. Following a period of warming, the evaporator’s flow rate can be increased using the valve. Once the fluid has cooled, the flow rate is lowered accordingly. Additionally, there is a sensor bulb in the evaporator that is positioned at a higher temperature and that senses the temperature of the coil
  2. And
  1. Capillary Tube- A capillary tube is a tube with a tiny internal diameter that is used in biomedical research. This tube can be coiled over the duration of its length and is typically connected to the suction system. It is usual practice to install a filter-drier before the tube in order to remove dirt and moisture from the refrigerant. The refrigerant contained in a system must be correctly calibrated at the factory level in order to guarantee that the devices operate extraordinarily effectively. Comparing the capillary tube to the thermal expansion valve or TXV/TEV, the capillary tube is often less expensive and is utilized in room or window air conditioners.
  1. The float valve is a type of valve that is controlled by a float that is submerged in the liquid refrigerant. Floats are used to regulate the flow of this liquid refrigerant on both the low and high sides of the compressor. When the low-side float is working properly, it assists in keeping the liquid refrigerant level within the evaporator at a steady level. There is no liquid in the evaporator so it opens and closes, and there is liquid there so it opens and closes. The high-side float, which is placed on the high-pressure side of the system, on the other hand, is responsible for maintaining a consistent amount of refrigerant in the condenser. Once the compressor is operational, a flow of condensed refrigerant is introduced into the float chamber, and the valve is then opened. The refrigerant is able to make its way into the evaporator as a result of this reaction. When the liquid level in the float chamber drops below a certain level, the valve opening will be closed. As a result of this procedure, the liquid is prevented from going into the evaporator even further.

Maximizing Your Aircon’s Performance

It is important to note that the expansion valve, like any other component of the air conditioning system, is susceptible to failure and repair. When it breaks, just like any other component of an air conditioner, the machine ceases to work and fails to provide any cooling. Because of this, it is critical to understand how an air conditioning expansion valve works, since it has an impact on how your air conditioning unit performs and functions. The valve is critical to the operation of an air conditioner’s overall system and, as such, should be given the attention it deserves through regular maintenance and inspection.

Oasis Aircon Singapore provides high-quality maintenance and repairs for all major air conditioning brands.

Our team of highly qualified air conditioning specialists is here to assist you with any and all of your air conditioning needs.

[ShopName] in [City] [ST]: Air conditioning – Auto body shop

When it comes to operation, the air conditioning equipment in your vehicle is comparable to that of a refrigerator.

The air conditioning system in your vehicle is designed to transport heat from the interior of your vehicle to the outside of it. The air conditioning system in your car is made up of six primary components:

  • The refrigerant is responsible for transporting heat. The refrigerant used in current automobiles is a chemical known as R-134a. The refrigerant used in older automobiles is referred to as r-12 freon, which is more expensive and harder to get than R-134a. The compressor is responsible for circulating and compressing refrigerant within the vehicle’s cooling system. The condenser in your vehicle converts the refrigerant from gas to liquid and removes heat from the vehicle’s interior. The expansion valve (also known as theorifice tube) is a nozzle that reduces the pressure of the refrigerant liquid while also metering its flow and atomizing it
  • It is used in air conditioning systems. The evaporator in your vehicle transmits heat to the refrigerant from the air pushed over it, allowing your vehicle to be cooled. Thereceiverordryerfilters the refrigerant and engine oil in your car, eliminating moisture and other pollutants from them
  • And
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When you turn on your vehicle’s air conditioning system, the compressor begins to function by applying pressure to the refrigerant and directing it to the condensing coils, which are typically located in front of the vehicle’s radiator (see illustration). The condenser is responsible for removing hot air from within the vehicle and cooling the air inside. When this occurs, the refrigerant is cooled and transforms from a gas to a liquid, which then travels through the expansion valve and into the evaporator to finish cooling the air.

In order to circulate air past the evaporator and into the vehicle’s cabin, the vehicle’s blower must be turned on.

It is possible for any of these components to become damaged during the summer months, turning your cool automobile into an inferno.

Whenever your vehicle’s air conditioning equipment is not functioning properly, bring it to JM Auto Center for repair service.

Search career opportunities at over 15,000 independently owned and operated NAPA AutoCare, Collision and Truck Service Centers.

Due to the extreme heat of the Australian environment, air conditioning is a typical automotive feature. Many automobiles are equipped with factory-installed air conditioning, while others are equipped with after-market air conditioning. Understanding the many types of air conditioners available and how they operate will assist you in making an informed selection about the finest air conditioning system for your needs and requirements. Do you want to learn more about the air conditioning system in your car?

The general function of air conditioners

The fundamental premise of an air conditioner is the removal of heat from the air within the vehicle by the use of a refrigerant, as explained above. R-134a is the refrigerant that is most often used nowadays. Hydrofluorocarbons are used in this product, and they are less hazardous to the ozone layer than their predecessors, the chlorofluorocarbons such as freon. Every automobile air conditioner is equipped with a compressor that raises the pressure of the refrigerant gas. As a result of this increase in temperature, the refrigerant temperature also rises.

  • After compression, the compressed gas passes through a condenser, where it is turned into a liquid under high temperature and pressure Before entering the evaporator, the refrigerant liquid must pass through either an aperture tube or a thermostatic expansion valve (TXV), where the temperature lowers dramatically. This conversion of the refrigerant from liquid to gas removes the heat from the evaporator and the internal vehicle air that is flowing over it.

The cycle is completed when the compressor removes suction from the evaporator, and the procedure is repeated to finish the cycle.

What are the two types of car air conditioner?

It is possible to find an orifice tube or a thermostatic expansion valve in car air conditioners.

All of them serve the same purpose, which is to allow the liquid refrigerant to expand and, as a result, lower its temperature in preparation for the evaporation process. They do, however, function in somewhat different ways:

Orifice tubes

Orifice tubes feature a fixed aperture, which causes a pressure decrease as the liquid passes through them. In other words, the orifice tube does not have any means of controlling the flow of refrigerant that passes through it. A critical consideration is the flow rate, since low flow rates might result in refrigerant freezing in the evaporator, which can cause clogs in the system. If the flow rate is too high, liquid may be carried through into the compressor, resulting in the compressor failing.

Thermostatic expansion valves (TXVs)

TXVs have the ability to control the flow of refrigerant by opening and shutting the valve as needed. In contrast, a smaller aperture restricts flow and creates a larger pressure drop across the valve, whereas a wider opening allows for greater flow and a lower pressure drop over the valve. It is controlled by the temperature at the evaporator output, which opens and closes the valve automatically. As a result, rather having the compressor turning on and off, the TXV regulates the operation of the air conditioner.

Pros and cons of the two types of air conditioner

  • They are less complicated than valves since they do not have any moving parts. Cons: They have the potential to take up particles from the compressor or condenser as it flows through. This would result in a clog in the system, which would negatively impact the functioning of the compressor.


  • It has several advantages, including: reducing compressor wear and tear by not operating the compressor on a continual basis
  • Pros: Because they have moving components, the valve itself may break even if the rest of the air conditioning system is functioning correctly. Cons:

Can you replace an orifice tube with a TXV

The air cooling system configuration for an orifice tube differs somewhat from the configuration for a TXV. It is not possible to swap one out for another without simultaneously making adjustments to the rest of the system as well. When using an orifice tube system, for example, there is an accumulator located downstream of the evaporator. This prevents any liquid refrigerant from reaching the compressor before it might cause damage. A TXV system, on the other hand, features a receiver/dryer that is connected to the condenser’s output.

Repairing or replacing your air conditioning system

The inability of an air conditioner to function properly can be caused by a number of different factors. These are some examples:

  • A low level of system pressure A failure of the compressor
  • An obstruction in the system
  • And so on.

In order to ensure proper diagnosis and repair, it is recommended that you send your car to an air conditioning professional. As the largest network of radiator and air conditioning workshops in the country, NATRAD serves customers throughout the country. Our professionals are standing by to assist you in getting your vehicle’s air conditioning to operate properly. Get in touch with us for all of your air conditioner diagnosis and repair requirements.

4 Symptoms of a Bad Car A/C Expansion Valve (and Replacement Cost)

Last Updated on June 10, 2021 Air conditioning is essential for the comfort of every trip you take in your vehicle, particularly in parts of the world where the weather is hot for a greater portion of the year. Yet many people do not understand how it works, leaving them with expensive car repair costs. Are you looking for a reliable online repair manual? The top five choices may be found by clicking here. Learning about what an A/C expansion valve does and its common failure symptoms will help you to keep costs down if it ever comes time to replace it.

How an A/C Expansion Valve Works

This valve’s primary function is to relieve pressure from the liquid refrigerant in the air conditioning system. This enables for expansion, and subsequently the refrigerant is converted from a liquid to a vapor inside the evaporator as a result. In addition, the valve regulates the flow of refrigerant, which is referred to as metering. The valve is equipped with a movable rod that may be moved up and down. When the route within is opened or closed, it allows refrigerant to enter or not, depending on the state of the system.

As you are aware, some days are hotter than others, and this control is required in order to regulate the air conditioning, otherwise you would be too uncomfortable in your vehicle.

Because the expansion valve wears down over time, it is one of the most common reasons that your air conditioner has ceased working properly. See also: How to Clean the Cabin Filter in a Vehicle

Bad A/C Expansion Valve Symptoms

Generally speaking, the first indication that something is wrong with your air conditioning system comes in the form of a symptom caused by a defective A/C expansion valve in the system.

1 – Poor Air Conditioning Performance

On a hot day, that initial indication is frequently accompanied by your air conditioning blowing warm air instead of cool air, even after allowing the car to run for a few minutes. If this occurs, it indicates that insufficient refrigerant is reaching the evaporator. If the airflow is not as cold as it used to be, at first glance, the situation may appear to be normal. However, no matter how low the temperature setting on your vehicle’s HVAC is, the situation may eventually progress to the point where warm air is blown out of the vents.

2 – Inconsistent Airflow From Vents

Simply put, the air that comes out of your vents will be either too warm or too cold compared to what you are accustomed to, and it will frequently change back and forth between the two temperatures. If you observe that the temperature within the car cabin appears to be fluctuating continually between warm and cold, it is possible that you have an issue with your vehicle’s expansion valve.

3 – Air Conditioning Constantly Running

Another sign is if your air conditioner’s compressor is operating all of the time. This is due to the fact that the expansion valve will become jammed and will fail to open. This implies that the compressor will continue to pump refrigerant into the A/system C’s even if you are already feeling the effects of the cooling system. It is advised that you take your car to a vehicle air conditioning repair shop to get it fixed at this point in time. Because the valves are generally located deep within your car’s air conditioning system, replacing them is not as straightforward as opening a door and pumping gas into your vehicle.

4 – Frost Forming on A/C Compressor or Vents

This is the polar opposite of the previous statement. It is in this instance that TOO MUCH refrigerant is allowed to flow into the evaporator unmetered, resulting in the evaporator freezing over and finally bursting into flames. Occasionally, you may even see a little amount of frost accumulating on one or more of the internal vents in the front of the cabin in severe circumstances. There will frequently be ice on the surface of the A/C expansion valve, which virtually confirms that it is the cause and will require replacement.

A/C Expansion Valve Replacement Cost

Most of the time, replacing your car’s A/C expansion valve will cost you between $150 and $350 in total. In most situations, the valve itself will cost between $50 and $150, while the labor will cost between $100 and $200, therefore it’s crucial to acquire a couple of bids first. Given your newfound understanding of the problems that might arise with your car’s A/C expansion valve, you can get down to business and ask your local repair shop what precisely the expenses will be, rather than paying for pricey labor to ‘find’ what is wrong with your A/C.

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