Jeep Diesel hydraulic radiator fan Issues? (Solution)

  • The AC is connected to the ac compressor. DIfferent fan. If the fuse looks good then it is probably good. Check the fan connections. Swap a relay? The fan will turn on after the temperature reaches about half. Usually comes on when the car is standing still due to the small amount of air circulating through the radiator.

How does a hydraulic radiator fan work?

The flow divider valve, the steering system and the hydraulic fan drive system function as if each system receives oil flow from a dedicated pump. The fan motor drives a fan to cool the charge air and engine coolant. The more oil that passes through the motor, the faster the fan speed.

How do you diagnose a bad radiator fan?

These are the most common signs of a faulty radiator fan assembly in need of replacement:

  1. Engine Overheating. When the radiator fan isn’t functioning properly, it is not able to adequately cool down the car’s engine.
  2. Air Conditioner Function Diminished.
  3. Loud Noise Coming From Radiator Fan.

How do I know if my radiator fan motor is bad?

The first symptom or sign that something has gone wrong is that your cooling fan doesn’t come on at all. This is the most common symptom of a faulty cooling fan motor, but it may not be one you notice while driving your vehicle. If the motor burned out or starts to fail in any way, the cooling fans are disabled.

What causes a radiator fan to go bad?

The most common reasons a radiator fan is not working are luckily due to a blown fuse, bad relay, or a broken wire. It can also be caused by a faulty coolant temp sensor, low coolant level or the fan itself can be damaged.

What is a hydraulic fan?

A hydraulic fan drive system allows variable fan speed independent of the engine speed. It provides only the cooling that is required throughout the operating range of the vehicle including such requirements as the maximum engine rated torque point where high cooling may be required at lower than maximum engine speed.

What is the advantage of hydraulic fan used in some motor grader?

Advantages of Hydraulic Variable-Speed Fan Drive This permits precise control of the coolant temperature with minimal temperature fluctuations, even when there are extreme changes in the engine load. Reduced Engine Wear — Allowing engine coolant to get too hot breaks down engine oil properties and reduces lubrication.

How do I know if my fan control module is bad?

Symptoms of a Cooling Fan Module Failure

  1. An overheating engine. When the cooling fan module fails completely, the cooling fans will not work at all.
  2. Cooling fans running non-stop.
  3. Poor circulation of fresh air in the cabin of the car.

How do I know if my radiator fan relay is bad?

Bad Cooling Fan Relay Symptoms

  1. The engine runs hot or overheats.
  2. The cooling fans don’t work.
  3. The cooling fans keep running.
  4. Warning lights.
  5. Poor air conditioning performance.
  6. Swapping Relays.
  7. Measuring the Relay Coil’s Resistance.
  8. Listening for Noises.

Can you drive a car if the radiator fan is not working?

As such, you should never drive your vehicle if the cooling fan isn’t working even though you can. If the radiator does not have cool air blowing on it constantly, it will overheat eventually, so you’d need the perfect combination of weather and traffic to drive effectively without a radiator fan.

What happens when radiator fan doesn’t work?

What happens if the cooling fan stops working? If your cooling fan stops working, your engine could overheat. This could cause damage to your engine parts. It’s a serious issue and needs to be looked at by a garage.

Will bad temp sensor cause fans to not work?

Cooling Fan Operation A faulty coolant temperature sensor may result in a fan not being properly used, which may cause the engine to overheat.

Why does my radiator fan come on when I start my car?

If the fan comes on, you may have a bad temperature sensor or gauge. 2. A cooling fan temperature switch (or sensor, in some vehicles) can also get stuck, which may cause the fan to run continuously any time you turn the ignition key on or start the engine. Troubleshoot the switch.

What does a bad radiator fan sound like?

A loud whirring Noise In some cases, when the radiator cooling fan motor fails, you’ll notice a loud clicking or whirring noise that changes as you rev your engine. Bad radiator fan noise might be so loud, but fixing it on time will save you from the expensive repair costs.

Jeep Diesel hydraulic radiator fan Issues

The radiator fan on the Jeep diesel engine is unlike any other radiator fan you’ve ever seen on another engine. Jeep utilizes a hydraulic radiator fan, rather than an electric fan or a mechanical fan with a viscous clutch, to cool its radiator. The hydraulic radiator fan is powered by the pressure of power steering fluid delivered by the power steering pump.

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How does the Jeep diesel regulate engine cooling?

The 5.7L and 3.0L diesel engines in Jeep are equipped with a hydraulic radiator fan. In order to operate, the hydraulic radiator fan is driven by a two-stage G-rotor hydraulic motor that is supplied by the power steering pump, which produces high pressure power steering fluid. When the fan control solenoid receives orders from the fan control module, it pulses the power steering fluid to regulate flow to the hydraulic motor. This controls the flow to the hydraulic motor (FCM). Take a look at the inputs below.

This is because the fan blade and hydraulic fan drive are matched and balanced as a system, and servicing each individually would upset the system’s balance.’

Fan control module operation

The FCM sets the speed of the hydraulic radiator fan by monitoring the inputs from three different sensors: The temperature of the engine’s coolant (ECT) Temperature of the transmission oil (TOT) AC System pressure is defined as follows: The FCM estimates the duty cycle of the fan control solenoid based on the inputs from these three sensors, and as a result, regulates the speed of the hydraulic radiator fan.

WARNING: Even when the engine does not require cooling, the fan will continue to spin at idle at rates ranging from 100 to 500 revolutions per minute.

What goes wrong with the Jeep hydraulic radiator fan system?

Whenever a sensor reading is outside of the acceptable range, the system encounters the most prevalent difficulty. For example, if the air conditioning pressure is too high, the radiator fan will operate at maximum speed all of the time. Starting with the values from the ECT, TOT, and AC pressure transducer is always a good idea when diagnosing a patient. Use a scan tool to examine the pulse width requested by the fan control module. If the values are within range, go to step 3.

Other problems with the Jeep hydraulic radiator fan system

Check to see that you’re using the right power steering fluid for your vehicle. There is no such thing as a ‘universal’ power steering fluid in the automotive industry. Check the level and condition of the power steering fluid.

Inspect the filter at the bottom of the power steering fluid reservoir to see if it is in good working order. Examine the power steering oil cooler for any debris that may be obstructing it. The year is 2019. Rick Muscoplat is a professional musician. Rick Muscoplat posted a blog entry on

Hydraulic Radiator Fan Fault Diagnosis Help Please.

Hi, The hydraulic cooling fan receives a signal from the engine control unit, which takes data from the engine temperature sensor, transmission fluid temperature sensor, outside temperature sensor, and battery temperature sensor combined, and sends it to the fan. When necessary, the system begins to cool gradually. When it’s idle, it spins so slowly that you can simply stop it with your palm. (It should rotate all the way around.) When the air conditioning is turned on, the fan runs at its maximum speed regardless of the engine temperature.

  • If this is the case, the solenoid (which regulates hydraulic flow) appears to be faulty.
  • You may also grip the solenoid and try to feel the opening of the solenoid by hand if you want to be certain that it has failed.
  • It contains a menu where you may progressively increase the fan’s speed from 1 percent to 100 percent by selecting it from the menu.
  • Regards.

hydraulic fan doesnt work

06:47 p.m. on March 6, 2014 Jan 2014 – Junior MemberThread StarterJoined the group: Jan 2014 Comments: 48Likes: 0Received 0 Likeson0 Comments: 48Likes: 0 Grand Cherokee is the model. Engine:4.7Ho The hydraulic fan is not functioning. Hello everyone, I was having an issue with the fan, but there were no OBD2 codes and no check engine light on, so I changed the power steering pump, thinking it was the only faulty item on the car. When I remove the ECT sensor, the fan runs like a jet, but when it is connected to the ECU, the fan does not work in either case of hot and cold or onidle, what should I check?

  • 6:00:51 p.m.
  • Which is better, a mechanical or an electric fan?
  • CF VeteranJoined the company in March 2010 and works in Broward County.
  • 04:14 p.m.
  • Some of the workers tried to replace it with an electric fan system, but they were having issues establishing the fault codes.
  • on the 7th of March, 2014, at 5:48 p.m.
  • Date of joining: January 2014 Number of posts: 48 No likes have been received, and no likes have been given on any of the posts.
  • Engine:4.7Hoyes Dave, it was the worst concept Mopar ever came up with, and it cost us even more money out of our pockets.
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on the 8th of March, 2014, at 1:34 p.m An old fart with a ratchet Date of joining: November 2010Location: Manlius, New York, east of Syracuse Posts totaling 14,398 Year: 2000 XJ SportWJ Laredo XJ SportWJ Laredo Grand Cherokee is the model (WJ) Engine:4.0L But this does not provide a solution to your problem.

  • That must be constructed as a fail-safe in order to prevent the engine from overheating.
  • (I’m just running this through my head as we talk) Make sure the connection at the PCM is clean and free of debris.
  • Examine the circuit to see whether there is a relay involved.
  • In the case of electric fans, there is a relay that is positioned behind the passenger’s headlight housing, and it is a PITA to reach.
  • 03/09/2014 06:35 a.m.
  • Date of joining: January 2014 Number of posts: 48 No likes have been received, and no likes have been given on any of the posts.
  • Engine:4.7Thanks, Dave, but on the hydraulic fan, they don’t have this relay; instead, they have a fuse called the ovp, which is not an issue.

on March 9, 2014 An old fart with a ratchet Date of joining: November 2010 Location: Manlius, New York, which is east of Syracuse.

It is possible that the PCM is not receiving a temperature signal to turn on the fan, or that the PCM is the problem.

Due to the fact that the fan is running and there are no leaks, you are under pressure.

IDK.

10:07 a.m.

This section is for all XJ non-modified/stock inquiries.

on October 10, 2017 MZ Questions for stock XJ Cherokees should be directed to eke P.

On the 30th of August, 2015, at 6:42 p.m. Chick-N-PickerStockXJ Cherokee Tech. Please direct all XJ non-modified/stock queries to this location. 2108-27-2015 01:27:27 PM 2108-27-2015 01:27:27 PM Users that are currently active on this thread are: 1 (0 members and 1 guests)

air/con hydraulic fan issue

I’m in the United Kingdom with a 3ltr diesel commander. Please assist me with the difficulty I’m having, which might be related to the hydraulic fan or a control module for it. I am not experiencing any issues with engine cooling, nor is there any overheating, and the temperature gauge is rock solid in the middle of the gauge (so assume it spins up as needed) I am not experiencing any transmission cooling issues, and there is no notice on the information center indicating transmission overheat (so I believe the solenoid valve is spinning up as needed).

The fan rotates at tickover speed, which is between 100 and 500 rpm, as specified.

In the last six weeks, I’ve carried a caravan over 100 miles with no engine or gearbox overheating issues whatsoever.

A reputable company recently recharged the air conditioning system, and they determined that the fan should be spinning faster than the 100 to 500 revolutions per minute at tickover when the air conditioning system is calling, as indicated by the compressor running, in order to clear the heat off the evaporator.

  1. Only 3 to 4 degrees Celsius are dropped from the ambient air temperature, for example, outdoors 23 degrees C and air coming out of the vent 18 to 19 degrees C.
  2. There are no DTCs that are blinking on the screen.
  3. a) Would the air conditioning system’s low charge (it had around 50 percent charge remaining in the system) cause a DTC to be triggered, which would prevent the fan from working, and it would be this DTC that would need to be reset?
  4. If so, which connector would I use to attach the 12v power supply?
  5. If I can demonstrate that it is the solenoid that is malfunctioning, I have identified the component number and can replace it myself, providing we can obtain the item in the United Kingdom.
  6. If it turns out to be anything else, you’ll most likely have to turn to a dealer and a patient bank manager.

I have got the TSB 07-002-06, which has a check aid chart that includes information such as the solenoid’s resistance reading. It also provides a current range if the device is operational and I am able to jumper the connections. Any assistance would be greatly appreciated.

2001 Jeep Grand Cherokee Hydraulic Fan Issues

I’m in need of assistance. I’m hoping someone on this forum may assist me in finding an answer. Vehicle – 2001 Jeep Grand Cherokee with a 4.7-liter V8 engine (High Output). This device is equipped with a hydraulic fan. I’d never seen anything quite like that before. Because of the excessive heat generated last week, we believe the fan is not spinning as quickly as it should be, and we will investigate further. The fan appears to be in good working order mechanically. Electrically, though, is a different situation.

  • I came across a page on the internet that instructed me to try a few different things.
  • That’s a nice thing.
  • It did not.
  • According to our best guess, the PCM controls the resistance on this wire in order to raise or reduce the fan speed as needed.
  • All of the wiring that I can discover appears to be in good condition.
  • Or, to put it another way, is there a sensor someplace that signals the PCM to tell the fan to turn on more quickly?
  • Is this going to cause any problems?
  • Thank you for your assistance, gentlemen.

Jeep Grand Cherokee Questions – power steering

Over the course of my three-plus years working at a Jeep dealership, I never changed a hydraulic cooling fan. I have changed the line that connects the PS pump to the fan (the hoses occasionally leak), but the fan itself has shown to be quite dependable throughout the years. Have you experienced a failure of your fan module, or are you looking to the future? Unless you have personal experience with failure, I would not be overly concerned about it. I’ve seen Jeeps with 150,000 miles or more on the odometer that had no leaks at the hydraulic fan.

You’d then need an aftermarket electric fan and fan controller if you absolutely have to get rid of the hydraulic fan.

A fan large enough to cool a 4.7 liter V8 engine will cost you at the very least $100, if not more.

The hydraulic fan is a reliable mechanism, and if it were my car, I would let it to run on its own. This was reported to be helpful by 7 people.

Engine Cooling Fan – Is Yours Working – How To Test It

How To Check If Your Engine Cooling Fan Is Working – Engine Cooling Fan Is Working

Your engine cooling fan, only runs when needed to help cool the engine.

Consequently, additional cooling is not required when starting a cold engine for the first time. Consequently, the engine cooling fan does not turn on until the engine reaches its regular operating temperature, which might take several minutes. Fan for the engine’s cooling system The fan will then cycle on and off as needed to keep the coolant temperature at the right level. As a result, when the engine is running at normal temperature, the fan is generally at idle or at a low speed. When the coolant temperature hits around 200 to 230 degrees, the majority of the fans should turn on.

So, Let’s Start With Some Easy Questions:

  • Check to see if your engine is overheating and whether your engine cooling fan is operating.

If Not, Let’s Do Some Testing And Try To Fix It Yourself:

Making a Visual Inspection for a Blown Fuse If you have a blown fuse in your engine cooling fan, the fan will not operate. In general, most automobiles on the road are equipped with two types of fuses. Older automobiles had fuses that are cylinder-shaped and made of glass, with stainless steel on the ends and glass in the center. Most contemporary automobiles feature a different form of fuse that is housed in a plastic container and has the fusible link enclosed inside it. As a result, the most straightforward method of checking is visually.

Another option is to make use of a multimeter.

So, if you find a blown fuse replace it. That may be all you need to get back on the road.

Cooling FanUnplug the fan connector that is closest to where the fan is located. Make a set of jumper wires for yourself. Once you’ve done that, connect the wires straight between the battery and fan motor and see if it spins.

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Consequently, if it does not spin it is blown. Replace it and you are back on the road.

Consequently, a failed fan or a failure of the fan relay or control circuit is a disastrous situation. Because it has the potential to cause the engine to overheat. The engine may also overheat in applications that have variable fan speeds, if the fan speed does not rise when extra cooling is required. The fan may be operational, however it only operates at a modest speed. This may not be fast enough to prevent overheating from taking place. A number of factors can prevent an electric cooling fan from turning on in general.

  1. Temperature switch, coolant sensor, or other sensor that is not working properly
  2. The engine thermostat is locked in the OPEN position (the engine never gets hot enough to activate the fan). Fan relay that is not working properly
  3. A issue with the wiring (blown fuse, loose or corroded connection, shorts, opens, and so on)
  4. A malfunctioning fan motor
  5. Fan control module that is not working properly

The Next Thing To Test Is The Coolant Switch Or Sensor

Fans are turned on and off by a coolant temperature switch, which is found on the majority of systems. So, find the coolant temperature switch and unhook it from the wall outlet. However, be certain that you have the correct one. Due to the fact that some cars have as many as three:

  • You could need one of these for a dashboard warning light or an overhead console. One for the (PCM)
  • And one for the (PCM).

Sensor Or Switch For The Coolant Consequently, with the engine running and the coolant temperature switch off, the fan should turn on automatically. In this case, the (PCM) will identify a faulty switch, save a Diagnostic Trouble Code(DTC), and turn on the fan to compensate (s). If it does not, and you are driving a domestic car, the coolant temperature switch is of the typically open variety, which means it will remain open until the coolant reaches the desired temperature. When the temperature is reached, the switch is closed, and the fan(s) are turned on.

To check this, unplug the single wire connector and, using a jumper wire, ground it. At this point the fan should come on. Most Japanese cars have a normally closed switch. Those switches open when the set temperature is reached, thus turning the fan(s) on.

In this way, cooling fan motors play a crucial role in the operation of every engine cooling fan assembly. In addition, they perform an important function in keeping the automobile at a safe temperature whether it is idling or traveling at moderate speeds.

Finally, if you believe that your cooling fan motors are malfunctioning, conduct some preliminary testing to see whether or not you can repair the problem yourself. Thank you very much!

How to Troubleshoot the Jeep Grand Cherokee’s Cooling Fan

During periods when the engine temperature is greater than typical, the cooling fan in a Jeep Grand Cherokee ensures that the engine temperature remains at a safe level. Without it, the engine might reach hazardous temperatures and cause damage to its internal components and other components. If the cooling fan stops operating, the majority of do-it-yourself technicians can analyze the problem in a matter of minutes and determine which component has to be replaced.

Step 1

Open the door on the driver’s side. Remove the cover from the fuse box, which is located at the far end of the panel. Locate the cooling fan fuse on the inside of the cover using the fuse diagram printed on the inside of the cover and remove it with needle-nose pliers. If the metal link within the fuse is damaged, the fuse should be replaced. Check to see that the fuse connection is not damaged and then replace the fuse and cover.

Step 2

Remove the cover for the power distribution block, which is located in the engine compartment on the driver’s side, toward the firewall. Locate the 40 Amp fuse on the inside of the distribution cover, using the schematic on the inside of the cover. Using needle-nose pliers, pull the fuse out of the socket. If the metal link within the fuse is damaged, the fuse should be replaced. Check to see that the fuse connection is not broken, then replace the fuse and cover.

Step 3

Unplug the electrical connector that connects to the fan motor, which is located in the center of the fan shroud’s rear panel on the left side.

Step 4

After removing the electrical connector, attach a fused jumper wire to the cooling fan terminal that is more exposed after unplugging the electrical connector. Connect the other end of the jumper wire to the positive battery terminal to complete the circuit breaker. A jumper wire is attached to the opposite terminal, and it is connected to the negative battery terminal via another jumper wire. If the fan does not operate, proceed to the next step in the troubleshooting process. Connect the wires to the terminals on the other side of the room.

The vehicle must be towed to a professional service shop for diagnostic testing on the PCM, which controls the cooling fan relays.

References

  • In 2005, John H. Haynes and Larry Warren published ‘Haynes Repair Manual: Jeep Grand Cherokee 1993 through 2004.’

What You’ll Need to Get Started

  • You’ll Need a Few Things.

Biography of the Author Eric Grosso has been a journalist since 2002, when he began working as a staff reporter, covering government events, school districts, athletic events, and musical performances, among other things. Published in ‘The Vindicator’ and ‘The Jambar,’ among other publications and websites, he has also contributed to KFFL and Plugged In Online. Grosso graduated from Youngstown State University with a Bachelor of Arts degree in telecommunications and journalism.

More Articles

Hello, everyone. If it makes a difference, I have a 2001 Jeep Grand Cherokee Limited with the 4.7L engine and 2WD, if that helps.

This one features a Hydraulic fan, which is just incredible. I spent a significant amount of time attempting to locate the relay, just to discover that there is none. In any case, my machine becomes overheated after being inactive for 5-10 minutes. As soon as I start moving, the temperature drops.

Where is the temperature sensor on a Jeep Grand Cherokee?

The temperature sensor, which is placed between the A/C compressor and the alternator, directly in front of the intake manifold and may be tested, should be unplugged before running the solenoid test. If the solenoid is correctly functioning, the fan will operate at high speed. If the fan’s rotational speed does not change, the solenoid or the cabling from the ECM to the solenoid is faulty.

Is the hydraulic radiator fan 4.7L still working?

I have a 2002 GCL 4.7L with a hydraulic fan, and it has performed admirably for the past many years. I had contemplated replacing it with an electric fan because I am more accustomed with them, but the hydraulic device has shown to be a reliable performer over the years. Even when the room is cool, the fan appears to be running at a constant pace. Hello, everyone. If it makes a difference, I have a 2001 Jeep Grand Cherokee Limited with the 4.7L engine and 2WD, if that helps. This one features a Hydraulic fan, which is just incredible.

  1. In any case, my machine becomes overheated after being inactive for 5-10 minutes.
  2. The temperature sensor, which is placed between the A/C compressor and the alternator, directly in front of the intake manifold and may be tested, should be unplugged before running the solenoid test.
  3. If the fan’s rotational speed does not change, the solenoid or the cabling from the ECM to the solenoid is faulty.
  4. I had contemplated replacing it with an electric fan because I am more accustomed with them, but the hydraulic device has shown to be a reliable performer over the years.

What should I do about my hydraulic radiator fan?

It is preferable to unplug the sensor when the engine is off and completely cool. Avoid getting your hands or clothing in direct contact with the fan and accessory drive belt while you’re working there with the engine running. But first, make sure that the hydraulic cooling fan control fuse16 in the PDC is working properly.

How to remove cooling fan from Jeep garage?

1. Thoroughly clean the gasket mating surfaces. Water pump should be positioned and mounting bolts should be installed as illustrated in step 2. Tighten the mounting nuts for the water pump to a tension of 58 N m (43 ft pounds). 3. Rotate the water pump to ensure that the impeller of the pump does not scrape against the timing chain casing or cover.

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Who is the manufacturer of the Jeep 4.7 engine?

Who is the manufacturer of the Jeep 4.7 engine? Chrysler is responsible for the production of both the 4.7 and 3.7 engines. Even the first model of its sort, which was introduced in 1999, was a breakthrough. The Jeep Grand Cherokee was equipped with a 4.7-liter V8 engine at the time.

Are there any drawbacks to a 4.7 Jeep engine?

A Jeep engine with a 4.7-liter displacement has a number of advantages, but it also has some disadvantages.

So, here are the most frequently encountered issues, as well as the most efficient answers. You will have a greater understanding of your car as a result of this. 01. Failure of the engine In this particular instance, it is one of the most often noted negatives by Jeep owners.

What to do if your Jeep Grand Cherokee cooling fan is not working?

If the fan does not operate, proceed to the next step in the troubleshooting process. Connect the wires to the terminals on the other side of the room. If the fan continues to not perform, the cooling fan motor and assembly will need to be replaced. The vehicle must be towed to a professional service shop for diagnostic testing on the PCM, which controls the cooling fan relays. If the fan does not run, the PCM must be replaced.

What kind of engine does a Jeep Grand Cherokee have?

Besides that, the 4.7-liter V8 engine is equipped with a contemporary coil-on-plug ignition system and a hybrid cooling fan system (in-line electric and engine-driven fans). Jeep Grand Cherokee Limited versions received a ‘High-Output’ version of the 4.7L PowerTech engine as an option in 2002, and Overland models received the engine as standard equipment.

Why is my Jeep running hot while sitting still?

If your Jeep is running hot while you are standing still, it is likely that the fan is not functioning properly. The fan’s operation manual should be available somewhere. It sounds like a clogged radiator or thermostat to me. Due to the fact that these jeeps tend to run a little hotter to begin with, while I was trying to figure out what was wrong with my cooling, I installed a 180-degree thermostat in mine.

When to turn on the hydraulic radiator fan?

As soon as the engine is turned on, the hydraulic cooling fan starts spinning at 500 rpm. As soon as the engine temperature increases beyond a particular threshold, the PCM commands the hydraulic cooling fan solenoid valve to open more, increasing the fan speed further.

What to do if your AC fan overheats?

Avoid getting your hands or clothing in direct contact with the fan and accessory drive belt while you’re working there with the engine running. But first, make sure that the hydraulic cooling fan control fuse16 in the PDC is working properly. When that one is blown, the fan just continues to spin at 500 rpm, causing you to overheat after a period of time spent standing still. It is preferable to unplug the sensor when the engine is off and completely cool. Avoid getting your hands or clothing in direct contact with the fan and accessory drive belt while you’re working there with the engine running.

Avoid getting your hands or clothing in direct contact with the fan and accessory drive belt while you’re working there with the engine running.

When that one is blown, the fan just continues to spin at 500 rpm, causing you to overheat after a period of time spent standing still.

What kind of fan does a jeep diesel engine use?

The radiator fan on the Jeep diesel engine is unlike any other radiator fan you’ve ever seen on another engine. Jeep utilizes a hydraulic radiator fan, rather than an electric fan or a mechanical fan with a viscous clutch, to cool its radiator. The hydraulic radiator fan is powered by the pressure of power steering fluid delivered by the power steering pump.

Can a hydraulic fan be replaced on a jeep?

A warning is included in the Jeep repair manual, stating that ‘the hydraulic fan and drive is not maintainable.’ Consequently, any failure of a fan blade, hydraulic fan drive, or fan shroud results in the need to replace the whole module.

This is because the fan blade and hydraulic fan drive are matched and balanced as a system, and servicing each individually would upset the system’s balance.’

Why does my Jeep Grand Cherokee Fan quit working?

In this article, we will attempt to permanently address a problem that is frequent with the Jeep Grand Cherokee from 1999 to 2004. Because of a breakdown in the electronic fan control relay, the electric cooling fan will stop operating and your Jeep will overheat. In order to prevent additional problems, I’ve installed a huge heat sink and relocated the relay to a more convenient location. If your Jeep is running hot while you are standing still, it is likely that the fan is not functioning properly.

It sounds like a clogged radiator or thermostat to me.

How does the cooling fan work on a Jeep Grand Cherokee?

During periods when the engine temperature is greater than typical, the cooling fan in a Jeep Grand Cherokee ensures that the engine temperature remains at a safe level. Without it, the engine might reach hazardous temperatures and cause damage to its internal components and other components.

What kind of fan does a jeep radiator use?

Please try your search again later. In this Jeep, the cooling fan is driven by a hydraulic fan motor, rather of an electric motor or a direct drive from the water pump as in other vehicles. This one was out while a new engine and radiator were being installed, which provided an excellent opportunity to show folks what these things are all about.

How does a hydraulic fan work on a radiator?

In this Jeep, the cooling fan is driven by a hydraulic fan motor, rather of an electric motor or a direct drive from the water pump as in other vehicles. This one was out while a new engine and radiator were being installed, which provided an excellent opportunity to show folks what these things are all about.

Why is my hydraulic radiator fan always turning?

Even when the room is cool, the fan appears to be running at a constant pace. It’s possible that this is due to the fact that it always has some hydraulic pressure from the power steering pump. I tested it while the air conditioner was running last week, and it was really speeding up for the added cooling. At that point, it might be able to suck a couple of tiny birds onto the grill.

What causes hydraulic fan to go into Hi Speed?

If the solenoid is correctly functioning, the fan will operate at high speed. If the fan’s rotational speed does not change, the solenoid or the cabling from the ECM to the solenoid is faulty. The fan’s rotational speed is displayed on a laser digital tachometer, which shows how the fan’s speed increases as the temperature rises and as the strain on the A/C system grows.

Why does my Jeep Grand Cherokee radiator not turn on?

When the negative wire is connected to the relay, the relay should activate with an audible click when the wire is connected to the relay. If the relay does not turn on, transfer the jumper wires to the second set of terminals in case the wrong terminals were being used when the relay was installed. If the relay does not activate, it is faulty. If the relay is found to be in excellent working order, the radiator fan switch should be checked.

Where is the relay on a Jeep Grand Cherokee?

In the fuse box on the driver’s side fenderwell of a Jeep, there are many relays that are the same (you can identify them by the relay number on the top or side of the relay).

Remove a relay that has been proven to be reliable and replace it with the radiator fan relay. Start the car and examine the operation of the unit that has been replaced with it.

When the negative wire is connected to the relay, the relay should activate with an audible click when the wire is connected to the relay. If the relay does not turn on, transfer the jumper wires to the second set of terminals in case the wrong terminals were being used when the relay was installed. If the relay does not activate, it is faulty. If the relay is found to be in excellent working order, the radiator fan switch should be checked. In the fuse box on the driver’s side fenderwell of a Jeep, there are many relays that are the same (you can identify them by the relay number on the top or side of the relay).

Start the car and examine the operation of the unit that has been replaced with it.

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