Blower motor only works on high speed? (Perfect answer)

Most car manufacturers use a series of resistors to make the heater blower motor run at different speeds. And when one or more of these resistors burn out, you’re usually left with only one heater blower motor speed—high. The resistor module is easy and inexpensive to replace.

  • If your blower only operates on its highest speed, chances are you have the series type of blower motor resistor. This is the most common failure mode. To repair the problem, simply replace the resistor block. It’s usually located in the ductwork (to keep the coils cool) below the glove box.

Why does my fan only work on high speed?

When a blower resistor fails, the highest fan speed usually is the only one that still works because it essentially bypasses the resistor and receives the maximum amount of voltage. When the resistor is working, it reduces the amount of voltage going to the lower fan speeds, so the fan runs slower.

What is the primary cause of a blower motor that only operates on its highest speed?

A bad blower motor resistor can cause your blower works on high speed only. Older style blower motor resistor with exposed resistor elements. The blower motor resistor is what’s responsible for giving you three blower speeds. The resistor block contains three different high resistance coils.

How do you tell if it’s the blower motor or resistor is bad?

Problems with a blower motor resistor are common in many cars. The most common symptom of a failed blower motor resistor is when the heater fan only runs at the highest speed setting (4 or 5) and doesn’t work at low speeds. In some cars, a failed blower motor resistor can cause a heater fan to stop working completely.

Will blower motor work if resistor is bad?

No air comes out of the vents There are instances where a bad resistor will prevent the current from reaching the blower motor altogether. Without any power, the motor won’t run. As a result, the blower fan stays still and silent, and no air blows out of the vents.

How much is a blower resistor?

The average cost to replace the blower motor resistor at a repair shop is between $44 and $55 in parts and $70 in labor costs, for a total cost of around $114 to $125.

What are the signs of a bad blower motor?

What Are Signs Your Blower Motor Needs to Be Replaced?

  • Poor or Airflow from Air Vents. This will be the first and most obvious sign your blower motor has a problem.
  • No Airflow At All From Vents.
  • Skyrocketing Energy Bills.
  • Strange Noises When You Turn on the Heat.
  • Overheating Blower / Weird Smells.

How do you test a fan resistor?

Place one lead of the Ohmmeter on terminal 1 of the resistor. Place the other lead on terminal 2 and check against specifications. If this circuit is open, showing infinity on the Ohmmeter, the blower resistor must be replaced. Move the lead from terminal 2 to terminal 3 and check this reading against specifications.

Why does my blower motor only work on low?

It sounds like this may be a sign of a faulty blower motor or bad wiring between the motor and the resistor. The electrical contacts may also wear out causing the motor to fail. I would recommend having an expert from YourMechanic come to your location to diagnose and replace your blower motor.

Why does my blower motor resistor keep burning out?

Trent, one of the biggest reasons for blower motor resistors to have shorten life is actually because of faulty blower motor drawing too many amps, some times melting wires/plugs, heating up resistors shortening their life.

What happens when a resistor fails?

When a resistor breaks down, current typically flows through the burnt resistor without any resistance and thereby passes unchecked. Other components in the circuit may become damaged from the excess current flowing through.

What happens when blower motor goes bad?

You might also hear ongoing whirring noises, or noises that change or get louder if you increase the fan speed. These are all signs of problems with the blower motor. In some cases, you may even notice smoke or smells of burning while driving, in which case you should pull over immediately.

Can a blower motor resistor be bypassed?

Blower resistors are made of several resistors with different resistances. In the highest speed state, the blower resistor is bypassed completely and the fan is connected directly to the car’s battery, which allows maximum current through the motor.

How do you test a blower motor relay?

Connect a test light or multimeter to the ground (black lead). Turn the ignition key to the on position (engine off), and remove the relay. Using the probe, test all terminal sockets in the relay connector. Two of the four should have power.

Is there a fuse for the blower motor?

Many vehicles have two fuses for the blower motor, one in the interior fuse block and the other under the hood. The blower motor is usually under the dashboard on the passenger side.

Blower works on high speed only

A blower motor resistor of an older design, with exposed resistance parts. The blower motor resistor is in charge of providing you with the three different blower speeds you may choose from. Three separate high resistance coils are included within the resistor block. Consider these coils to be similar to the filament of a light bulb. The resistance of the coils leads them to heat up, lowering the amount of voltage that can be sent to the blower motor as a result. When a resistor coil burns out, the fan speed is no longer available.

Because they are constructed in series, if one resistor fails, you lose speeds 1 through 3.

Most automobile manufacturers, on the other hand, bypass the blower motor resistor altogether when the fan speed lever is set to the highest setting.

This is the most often seen failure mode.

Find the blower motor resistor

It is sufficient to replace the resistor block in order to resolve the issue. It’s normally found in the ducting below the glove box (to keep the coils cold), so look for it there. Remove the electrical connector from the unit, then remove the screws and replace the unit with a new one. A replacement blower motor resistor block may generally be found at any auto parts store or from the dealership. The cost of a blower motor ranges from $15 to $40 dollars, unless you have one with variable speed.

They are quite expensive, as you might expect.

A clogged cabin air filter can cause blower motor resistor failure

If your car is equipped with a cabin air filter, make sure to inspect it before reassembling everything. A blocked cabin air filter lowers airflow through the ducts, increases current draw on the blower motor, and can cause the blower motor resistor to overheat and fail prematurely due to the increased current draw. If you replace the resistor and the problem persists, examine the current draw on the blower motor to determine the cause. Any more amps are enough to melt the plastic connection at the resistor, even if it is only a few.

If you discover this, you should purchase a new connection pigtail from the dealer and splice it into the existing wiring harness.

Rick Muscoplat was born in the year 2012.

Car Heater Repair Tips: Fixing a Blower Motor

Mr. Fix-It-Up-For-The-Family By replacing a resistor module in your auto heater/air conditioner blower, you may restore the ability to operate at numerous speeds. It’s a straightforward and quick swap out.

Restore multiple speeds to your heater blower motor


Fix-It-Up-For-Us. By replacing a resistor module in your auto heater/air conditioner blower, you may restore the ability to operate at numerous speeds again. Changeover is straightforward and rapid.

Required Tools for this Project

Mr. Fix-It-Up-For-Us By replacing the resistor module in your auto heater/air conditioner blower, you may restore the ability to operate at numerous speeds. It’s an easy and quick swap out.

See also:  PassLock Security Light On? (Perfect answer)

Required Materials for this Project

Preparing all of your materials for this automobile blower motor repair ahead of time can save you time and money by avoiding last-minute shopping visits. Here’s a list of things to do.

Why does the blower in my car only work on high?

Asked in the following category: General The most recent update was on May 5th, 2020. Whenever a lower resistor fails, the fastest fan speed is frequently the only one that continues to operate since it basically bypasses the resistance and obtains the largest possible amount of electricity. Whenever the resistor is in operation, it limits the amount of voltage that is sent to the lower fan speeds, causing the fan to run more slowly. Most automobile manufacturers employ a set of resistors to allow the heater blower motor to operate at a variety of speeds.

  • Replacing the resistor module is a simple and affordable process.
  • Blower motor resistor failure is most commonly shown when the heater fan only operates at the highest speed setting (4 or 5) and does not operate at lower speeds.
  • Why, in light of this, does my heater only operate at maximum capacity?
  • The maximum fan speed setting may still function well because, in most automobiles, the current bypasses the blower motor resistor at the highest fan speed level.
  • It is most probable that the motor will not function at any speed if one of the following factors are present: blown power supply fuse, poor motorground connection, faulty motorspeed control module, or a failed motor.
  • Blowermotors aren’t known for failing out of the blue all of the time.

Heater Blower Motor Resistor provided the image used in this post. Depending on the fan speed set or, in the case of an automated climate control system, the interior temperature and other parameters, the heater blower motor decreases or increases the volume of air flowing through the dashboard vents. However, resistors, which are little electronic components that are hidden from view, are responsible for controlling the fan speed by lowering the amount of electrical current that flows through the blower motor.

  1. While the resistor burns out or wears out due to corrosion, there is little that can be done to restrict the amount of power that is sent to the blower motor when the fan is running at the lowest speed, therefore the motor will most likely get the maximum current and spin at maximum speed.
  2. In other cars, however, the fan may not function at all, and only a little amount of air may be drawn through the vents.
  3. One additional possible explanation is that the electronically controlled “blend doors” that guide air flow have been stuck or damaged.
  4. When a blower resistor fails, the highest fan speed is frequently the only one that continues to operate since it basically bypasses the resistor and obtains the greatest amount of power available from the battery.
  5. Fortunately, blower resistors are tiny parts that may become corroded or just burn out, and a replacement one is usually less than $50.
  6. Despite the fact that having only one fan speed is typically indicative of a broken blower resistor, conscientious mechanics will verify the resistor, fan switch, and connections to the blower motor to ensure that they are not missing anything before replacing components.

If none of the fan speeds work, the next obvious step is to check the fuse or fuses for the heating, venting, and air conditioning systems, which should be the first thing you do.

Replaced resistor didn’t fix problem only high speed blower

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02-23-2017, 03:36 PM 1
Junior MemberJoin Date: Dec 2015Posts: 27 Replaced resistor didn’t fix problem only high speed blower

I replaced the blower motor on my ’94 Monaco Dynasty since it started making squawking noises. It now works fine. About the same time as the squawks began, the bottom 3 speeds failed to work. Only high speed works. This is most commonly a resistor and I have changed that part out only to have the same problem. It is not a bad fuse. Any thoughts on what it could be other than a bad (or wrong?) new part?Muchas gracias._Gypsy Stew Band – DonGayle + Marshall Tucker, a Cairns/Russell terrier mix – 1994 Monaco Dynasty – 2003 Honda Odyssey “Dive Bar Assault Vehicle” toad (on dolly)

Join the1 RV Forum Today – It’s Totally Free! RV Community -Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you’ll find that iRV2 is a great community to join. Best of all it’s totally FREE!You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners,see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!
02-23-2017, 03:53 PM 2
Registered UserJoin Date: Aug 2014Location: western NC mountains!Posts: 4,106 this happened on our toad a while back – the simple air blower Resistor replacement solved the issue. your new part might be faulty: /
02-23-2017, 04:25 PM 3
Senior MemberJoin Date: Oct 2016Posts: 1,546 Hi GypsyDon; I had almost the same problem on my 2001 Windsor. Coming home from Az. after purchase in 03, all I had was high speed on the blower motor. Since I had purchased an extended warranty, I took it to the local Monaco dealer to have the blower speed fixed along with other problems. After repair, on the way home, I selected floor heat and the blower motor was still only on high. Looked up parts replaced and it showed new blower motor resistor pack replaced with a part number. I pulled the resistor pack out and found that all the resistor windings were touching each other. I took that part back to the dealer and they ordered me a new resistor pack, which is a Ford part. Checked to make sure all coils were separated and installed. I then had all my speeds, not just high. I think when they installed the resistor pack, they jammed it into the opening causing the coils to be pushed together. It might be something you might want to check. Hope this helps. Good luck and let us know what you find out.
02-24-2017, 07:07 AM 4
Senior MemberDamon Owners Club Workhorse Chassis OwnerJoin Date: Mar 2009Posts: 24,023 Two or 3 possible suspects, One is way down the listTop is the resistor, in this case HIGH speed will work but MED and/or LOW will not.2 on the suspect list is the control switch and/or relays. This can get confusing.If the switch is bad you can have HIGH only, or HIGH HIGH HIGH or any single speed ONLY, or no operation or. Well you get the idea.If the relays are bad. Depending on your system you may or may not have relays, GM type systems including the one Workhorse used (The blower motor is a GM part) typically use two relays, one for HIGH one for everything else. A bad “low speed” relay will prevent medium and low speeds from working, but HIGH will still work, a Bad HIGH speed relay you may not have HIGH or you may, or you may not be able to shut it off.All very confusing.Finally way down the page is a short in the wiring. Not likely but possible, or a broken, chewed through, wire._Home is where I park it!
02-24-2017, 09:22 AM 5
Senior MemberJoin Date: Mar 2011Location: SF peninsulaPosts: 205 Sounds to me like your fan motor bearings are failing. The way that speed is controlled is to put different value resistors in series with the motor, dropping the voltage that the motor sees. The highest speed is no resistor, with lower speeds having progressively larger resistors. Those resistors get hot, so the way to keep them from melting and failing is to put them in the air stream from the fan to keep them cool.You mentioned “squawking,” a classic symptom of bad bearings. Bad bearings will load the fan motor down, reducing its speed. As the speed drops from loading, the fan’s current increases, the resistor air cooling drops and the resistors get too hot and they melt. The fan now runsIn the high speed mode only, because there in no resistor in that mode. The fan now draws more current and will continue to run until it either the bearings seize up to a fuse goes.If you can get at that fan motor. You might be able to oil those bearings, but it would be prudent to just replace the motor. The bearings usually are porous sintered bronze which is saturated with oil. But, by the time that they start making noise, the motor shape will be scored and any fix will be temporary.Dick L. ’04 HR Imperial
02-25-2017, 08:25 AM 6
Senior MemberJoin Date: Nov 2009Posts: 208 Don, I just had to repair mine last week. There is a small device on the fan speed controller. It’s about a half inch long and 1/8 inch in diameter and looks a bit like a small capacitor. It’s actually a thermistor. It’s a safety device which will burn open if overheated. If you can check the thermistor with an ohm meter, should show zero ohms if good. You could also clip a wire across it and try the fan speeds to prove its the problem. I suspect it got blown by the falty bearings causing higher than normal current causing extra heat at the resistor device.The new resistor you got was probably faulty from the start. Also make sure none on the wire coils are touching.Good luck.Larry
02-25-2017, 12:42 PM 7
Junior MemberJoin Date: Dec 2015Posts: 27 Still working the fan speed problem.

I tested the new resistor and it checked out okay. I tested the old one and confirmed that it was not okay so I re-installed the new one making sure that the coils did not touch. I will pull the damn dash out again check for this thermistor. Thanks for the tip. Any experience with where to find relays that might be bad? I see lots of relays but none are labeled or the labels have come off. And the adventure continues._Gypsy Stew Band – DonGayle + Marshall Tucker, a Cairns/Russell terrier mix – 1994 Monaco Dynasty – 2003 Honda Odyssey “Dive Bar Assault Vehicle” toad (on dolly)

02-25-2017, 07:39 PM 8
Senior MemberJoin Date: May 2012Location: Roseville MN sum / La Feria Tx winterPosts: 790 My 03 dynasty has intermittent no low or high med works on dash fans. Where is the fan and resistor located. In behind gen front hyd door? How do you get there to check?_SheriDon 2003 Dynasty 42″ regal ISL 4002007 Goldwing Trike Gmc 4X4 w/ autoloader for trikeLets go we got it all loaded.
02-25-2017, 09:38 PM 9
Senior MemberJoin Date: Nov 2009Posts: 208 Don, I don’t think I was too clear. The thermistor is located on the resistor assembly. My resistor is the Ford model, three wire coils and the Themistor. It’s mounted outside on the firewall in the heater and air conditioning core cover. Any time the blower motor is running the air flow helps cool the resistor coils.Larry. 1998 Monaco Executive
05-25-2021, 05:31 PM 10
Junior MemberJoin Date: May 2021Location: Farmington, NMPosts: 1 Front blower only blowing high – repair

I ran into the same issue. I have posted a detailed explanation of the fix in Files.

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Blower motor, resistor: how it works, symptoms, problems, testing

The most recent update was on August 1, 2021. In automobiles, a blower motor is a type of motor that drives the fan in the vehicle’s heating and air conditioning system. It is usually found inside the dash, on the opposite side of the steering wheel, or inside the engine compartment, on the firewall, depending on the vehicle. It is the blower motor resistor, also known as the blower motor control module, that is in charge of controlling the blower motor’s rotational speed. What exactly is the distinction?

It is used in automobiles if the blower motor has just four or five fixed speeds, as seen on the left side of this picture.

As seen in the photograph, an electronic blower motor control module is installed in cars equipped with an automated temperature control system and vehicles in which the blower speed may be changed gradually.

This is done in order to allow air to circulate around the resistor or control module, allowing it to cool down.

Blower motor resistor / control module problems

In many automobiles, problems with the blower motor resistor are prevalent. Generally speaking, the most typical sign of a failed blower motor resistor is that the heater fan only operates at the maximum speed level (4 or 5) and does not operate at lower speed settings. In some automobiles, a faulty blower motor resistor can cause the heater fan to stop functioning altogether in rare instances. The majority of the time, a blower motor resistor fails as a result of corrosion or overheating. Mechanical resistance to motor rotation can occasionally result in an excessive electric current flowing through the motor, causing it to overheat and prematurely destroy the blower motor resistor.

Problems with a blower motor control module are less common, but they occur for the same reasons: corrosion or overheating when the motor is blocked or shorted, for example.

Occasionally, a faulty blower control module or processor can cause the blower motor to continue operating even after the ignition is turned off in some vehicles (e.g., older General Motors trucks).

How is the blower motor resistor diagnosed?

The rust in this Ford blower motor resistor has caused it to fail. Diagnostic procedures differ from one another. A visual check of the resistor will frequently uncover the source of the problem. Examples include the failure of the blower motor resistor in a Ford Escape due to corrosion, as shown in this photograph of the vehicle. The resistance between the resistor’s terminals must be tested and compared to the manufacturer’s requirements if there is no visible damage to the resistor. If the resistance is not within specifications, the resistor will need to be changed.

According to the service handbook, the resistance should be between 4-5 ohms.

In our scenario, the ohmmeter indicates that the resistor has failed, which signifies that the resistor has failed.

This indicates that after replacing the blower motor resistor, you should check to see if the blower motor is running smoothly and without making any noise.

This was a prevalent problem in earlier Chrysler and Dodge minivans, for example. In this scenario, it is also necessary to replace the blower motor. When a blower motor is worn out, it might make a loud screeching noise occasionally while operating, which is one of the signs of the problem.

How to test the blower motor?

If the blower motor does not function at all, the blower motor itself must be inspected first to determine the cause of the problem. Most of the time, this is accomplished by monitoring the voltage at the blower motor connector when the blower is switched on. There should be a voltage present at the motor (at least 4-6 Volts at low speed and 12 Volts at high speed), but the motor should not be running because it is defective or stuck. Checking the voltage at the blower motor is a good idea. It is a defective motor if there is voltage at the motor (at least 4-6 Volts at low speed and 12 Volts at high speed), yet it does not operate while there is voltage present.

  • This occurs often in a large number of automobiles.
  • This includes testing the circuit starting at the fuse.
  • A faulty blower motor will necessitate the replacement of the unit.
  • This is a relatively simple task in many automobiles; the blower motor is placed under the glove box and is held in place by three to four screws.
  • If you want a proper diagnostic method, we have provided various links to websites where you may obtain a service manual for your vehicle for a small membership charge.

How is the blower motor control module tested?

A scan tool, which is used by mechanics at dealerships, may be used to diagnose the HVAC system. If you do not have access to a scan tool, many automobiles with automated climate control systems have a self-testing or diagnostic mode that you may use instead. Typically, it may be initiated by pressing and holding various buttons at the same time. According to the service handbook for the 2009 Honda Accord, the following is how the process should be performed: Set the ignition to the “ON” position.

  1. Once in the self-diagnostic mode, the system will display a fault code on the display if there is a problem.
  2. The testing technique for each code is described in detail in the service manual.
  3. Another method is to check the voltage at the blower motor, the blower motor control module, and other sections of the circuit in accordance with the service instructions for the particular model.
  4. Honda power transistor is being tested (blower motor control module).
  5. The power transistor has four wires: two come from the temperature control system control unit, one is for ground, and one is for the negative terminal of the blower motor.
  6. The service handbook recommends checking the voltage at the blower motor first, and if that is not satisfactory, checking the voltage at the power transistor and so on.
  7. According to Honda advisory 03-048, a fault with the blower motor for the rear HVAC system in the 2003 Pilot was characterized as not working at all speeds when the vehicle was started.
  8. BMW refers to the blower motor control module as a Final Stage Unit, and it is likewise a component that is prone to failure.
  9. More information may be found in the followingYouTube videos.
  10. This condition, which occurs in cold weather, is described in detail in General Motors bulletin 06-01-39-002C.

According to the notice, the blower motor control module should be replaced. It is referred to as the Linear Power Module by General Motors (LPM). More information may be found in the followingYouTube videos.

Repair options

Your neighborhood mechanic or any small repair business should be able to determine the source of the malfunction. Of course, scheduling an appointment with your dealer is the most expedient option. A large number of dealers have the component in stock. The cost of replacing the blower motor resistor or control module is not prohibitively high. A coworker of ours, for example, had an issue with his 2011 Ford Escape, which had a fan that only operated at speed 4. In the end, he spent $50 for the diagnosis and $112 for the resistor replacement at a local Ford shop.

  1. The blower motor resistor is found on top of the HVAC unit, behind the glove box, in the Ford Escape / Mazda Tribute from 2008 to 2011 model years.
  2. It’s kept in place by two screws and is simple to swap out.
  3. The blower motor resistor is likewise positioned beneath the glove box in the Ford F150, however it is mounted on the right side of the plastic air duct in the model years 2008 to 2011.
  4. It was written by the author of this site on his experience changing the blower motor resistor in a Jeep Liberty.

How the blower motor resistor works

Diagram of a typical blower resistor This figure illustrates the connection of the blower motor resistor in a common automobile. In this vehicle, the resistor is bypassed when the fan speed is set to the maximum “4” level, and the blower motor is driven directly by the fan switch. That is why, in some vehicles, even if the resistor is damaged, the blower motor may continue to operate at the “High” speed setting. The fan switch is set to speed “1” in this figure, and the blower motor current is lowered by three resistors (R2 + R3 + R4) that are connected in series with the fan motor.

In the option “2,” there are two resistors linked in series, however in the setting “3,” there is just one resistor connected in parallel.

When numerous resistors are linked in series, the overall resistance increases and becomes equal to the sum of the individual resistances in each series connection.

Blower motor only work on high

All General Motors blowers in air conditioning systems from the early 1960s through the 1980s, more or less, fed the current for the fan straight from the battery, though a 30A fuse and a relay, for the high blower speed, and then back to the battery again. Reduced speeds were sent through the resistor. The switch transmits the lower three speeds through the resistor and delivers the high speed to the relay, which then activates the switch’s functions. Due to the fact that lower speeds pass through the relay after the resistor, while the motor is not powered, the relay routes lower speeds to the motor while routing full battery current to the motor when the motor is energized.

It is exceedingly improbable that a switch failure will result in just one speed being operational.

The Fisher Chassis Service Manual, together with the Fisher Body Manual, are required.

Greetings and welcome to ClassicOlds. I’m Eric, and I’m writing to express my gratitude for everything you’ve done for me.

HVAC Blower Motor works only on high speed

Malraux had first posted this. The 09 should be covered by the tsb, albeit the time mileage may be a concern in this instance. I just happened to come across this information while clicking on the “TSB and Recall” link on the primary Forum page (next to logout). It appears that the TSB for the AC Blower Motor is now applicable to all 2009 and 2010 Fits, as well as certain 2011 Fits. I do not, however, have a membership to alldata, thus I am unable to view all of the information. If I had known this beforehand, I would have enquired further about the goodwill repair issue via the dealership.

4th of March, 2011 09-097 09-097 4th of March, 2011 This applies to: 2009-10 Fit – EVERYONE VIN JHMGE8.B5000001 through JHMGE8.B5000012 for the 2011 Fit.

* The HVAC Blower Motor Only Operates at High Speed (This document supersedes 09-097, which was issued on December 11, 2009, and which revised the material denoted by asterisks.) * SUMMARY OF THE REVISION All 2010 models, as well as select 2011 models, have been added to the Applies To section.

CAUSES THAT MAY BE INVOLVED The HVAC blower motor is using an excessive amount of electricity.

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