Question about 2004 GMC Envoy

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Cooling fan clutch not operating properly - 2004 GMC Envoy

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  • GMC Master
  • 1,165 Answers

Does your Envoy sound like a big rig? Like the clutch is engaged and won't disengage? Replace the fan clutch, very common problem with these.

Posted on Jan 01, 2011

  • Jose Oct 01, 2013

    i had the same problem i changed the fan clutch it still sounds like a big rig.

  • Ryan Lutton
    Ryan Lutton Oct 01, 2013

    Update, I bought a newer TB, just finished replacing my fanclutch. The new fan clutch is bad. Replaced it with another new one, and now it ticks. Will be switching brands of fan clutches to see if it works.

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1 Answer

Fan clutch is not working properly will it hurt to drive it


Well Clifford, that depends. IF the fan clutch fails in the locked or on position, it is noisy, and adds load, but should be okay.
If the fan fails into free wheeling, overheating is a risk, as you cannot cool properly.

Mar 31, 2016 | Cars & Trucks

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Engine overheats under load


There are quite a few reasons the engine could overheat other then a failed cooling fan clutch. I wonder if the fan is always on because the engine is always running hot?
This condition may be caused by any of the following possibilities:
• Installation of an aftermarket grille.
• A plugged charge air cooler.
• Fan clutch not operating properly.
• Drive belt slip.
• An overfilled transmission.
• Turbocharger not operating properly.
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Hope that helps........

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1 Answer

Compressor Clutch disengages and Radiator Fan starts to run loudly


The radiator fan should turn on when the a/c clutch engages as this is designed to increase the cooling of the engine as the a/c increases the engine loading. But the compressor clutch should stay engaged as long as there is need for cooling, and disengage/re-engage as the temperature control calls for cool air. The radiator fan will shut off IF the engine temperature is cool enough to do so, as it is regulated by heat, as well as the A/c override.

If your air conditioning is not cooling the car and the clutch is simply disengaging prematurely, have the temperature control and relay checked for proper operation. Also have the refrigerant level checked to assure there is adequate refrigerant in the system and no leaks. My first bet would be the relay or the thermostatic temperature control under the dash.

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1 Answer

2005 grandcherokee 4.0 Overheats when idleing in traffic. WILL IMMEDIATELY COOL DOWN WHEN RPMS ARE INCREASED TO 3500 FOR 1-2 MINUTES. nO WATER PUMP NOISE, NO LEAKAGE, COOLANT LEVEL IS oK, ELEC FAN OPERATES...


Hello and welcome, it sounds like you need to replace your fan clutch. Your Jeep has 2 cooling fans 1 runs off the engine the other is electric. Before replacing the fan clutch you need to make sure the electric cooling fan is working just turn on your a/c and it should kick on. If it does then the problem is your fan clutch is it doesn't then your electric fan is most likely bad.

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1 Answer

Service engine light is on and code P0526


The Powertrain Control Module (PCM) uses the cooling fan speed signal in order to determine the actual fan speed in relation to the desired fan speed. The PCM uses the cooling fan speed signal in order to reduce the cooling fan noise and in order to maintain the powertrain cooling requirements. The PCM supplies power and ground to the clutch hall effect sensor of the cooling fan clutch. The hall effect sensor returns a signal pulse through the speed signal circuit in response to the reluctor track, which is located inside the fan clutch. If during operation, the PCM detects a loss of the cooling fan speed signal, DTC P0526 will set
  • An inline connector could cause an intermittent DTC. Ensure to test for poor connections and pin retention at all inline connectors. Refer to system schematics for connectors and locations.
  • If the condition is not present, refer to Testing for Intermittent and Poor Connections.
  • Disconnect the harness connector of the cooling fan clutch from the shroud. Inspect the exposed wires between the harness connector and the tubing.
  • Inspect the cooling fan clutch harness in order to ensure that the clutch supply voltage circuit is not shorted to the following circuits:
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  • The cooling fan speed signal circuit.
  • The low reference circuit.
  • DTC P0526 will set if the engine is started without the drive belt ON.

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3 Answers

I have 2003 grand cherokee with 140000 miles that overheats at idle. as soon as i start moving again, the temp goes back to normal.


You have two fan's on your truck, 1 is a fan clutch runs with the drive belt, 2 elec fan motor, with test light and engine running at normal temp, just a little bit above 1/2 way on your temp gauge check voltage at elec. cooling fan harness if you have voltage at one of the two wire's and fan don't turn on, bad cooling fan motor, on the fan clutch after you check voltage at elec. fan motor turn engine off, with your hand spin drive belt fan if it spin's freely bad fan clutch, replace it.Also check cooling level.Hope this was very helpful

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1 Answer

Engine makes loud roar


It sounds like a fan clutch has failed.

A fan clutch is a thermostatic device that exists as an integral component of certain automotive cooling systems. When the engine is cool or even at normal operating temperature, the fan clutch partially disengages the engine's mechanically-driven radiator cooling fan, generally located at the front of the water pump and driven by a belt and pulley connected to the engine's crankshaft. This saves power, since the engine does not have to fully drive the fan

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2 Answers

High mileage 1996 Ford Explorer v8 overheats at 75-80 mph


if your mechanic seen no leaks from hoses or thermostat housing its sounds that either your fan clutch or your thermostat is bad. if its heats will driving streets and not highway its your fan clutch and needs to be replaced. if it overheats in streets and highway its your thermostat and needs to be replaced,you will need a thermostat and gasket with some silicone. Drain, follow the radiator hose to the housing and take 3 bolt off, clean housing well,CAREFULLY install the t-stat exactly the way is was taken out (pic), gasket,sillicone, bolt. ecc3d0c.jpg   its an easy job. Good luck!

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