Question about GMC Envoy

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My fan has play & makes noise. if the clutch fan is replaced, do the water pump have to be replaced too?

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Posted on Jul 24, 2016


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 2005 s10 fan clutch

autozone has a simple diagram but it serves your purpose

Posted on Aug 24, 2008

  • 46 Answers

SOURCE: water pump replacement

Get a wrench that fits on the fan clutch. Most auto part stores will have a fan clutch removal tool.

It works the best if you put the wrench onto the fan clutch and then hit it with a hammer in the dirction to take the clutch off. Sometimes it might take multiple tries to break the clutch loose.

Posted on Aug 29, 2008

  • 599 Answers

SOURCE: Water Pump Replacement

it is pressed onto water pump..will not come off when you remove fan clutch

Posted on Dec 05, 2008

  • 1 Answer

SOURCE: Vibration/Whinning Noise while drivin

check your motor mounts or your u joints. they can cause a noise and vibration. make sure your truck is in nutral when you move the drive shaft... if it moves at all or clunks that could be your problem. also an old motor/tranny mount could change your drive shaft angle and cause a noise and vibration

Posted on Apr 24, 2009

  • 2926 Answers

SOURCE: 1995 Jeep Cherokee Sport. Keeps overheating.

Clutch Fan are known to fail over time, but I wold not rule out the radiator. The small passages inside the radiator will clog due to age. You did not mention how many miles are on the Jeep or if the Aux fan is kicking on.

Posted on Jun 29, 2010

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My 1999 ford RAnger has heat but the fan makes alot of noise and does not blow out the heat and the trucks gauge will go hot. What would the issue? Heater core or mayb just the fuse?

Diagnose Cooling Fan Clutch On engines with belt-driven cooling fans, a fan clutch is often used to save energy and reduce noise. The fan clutch disengages slows or disengages the engine's cooling fan when extra cooling isn't needed. The fan pulls air through the radiator and air conditioning condenser when the vehicle isn't moving fast enough to provide adequate airflow for cooling. A fan can eat up anywhere from a couple of horsepower up to 12 or 15 hp on a big V8, so by reducing the parasitic horsepower loss on the engine the fan clutch makes a noticeable difference in fuel economy

TWO TYPES OF FAN CLUTCHES basic types of fan clutches: thermal and non-thermal (also called "torque limiting Thermal fan clutches have a temperature-sensitive bimetal coil spring on the front that reacts to temperature changes. When the air coming through the radiator is hot, the spring expands and opens an internal valve that reduces clutch slippage. This causes the fan to spin faster for increased cooling. As the air cools, the spring contracts and closes the valve. This increases the amount of clutch slippage, allowing the fan to slow down and decrease cooling FAN CLUTCH OPERATION

The clutch consists of a fluid coupling filled with a silicone based oil. In the cutaway view at the left, the area between the teeth on the clutch plates is filled with silicone fluid. An internal valve opens and closes a passage between the main fluid cavity and a fluid reservoir. When the passage is open, fluid enters the clutch and makes the fan to turn faster. When the valve is shut, fluid flows back to the reservoir but doesn't return, causing the clutch to slip and the fan to turn more slowly.
The non-thermal (torque limiting) fan clutch doesn't have a temperature sensing capability. It reacts only to speed, slipping to limit maximum fan speed to about 1200 to 2200 rpm depending on the application.


A slipping fan clutch is often overlooked as the cause of an engine overheating problem.
As a fan clutch ages, fluid deterioration gradually causes an increase in slippage (about 200 rpm per year). After a number of years of service, the clutch may slip so badly that the fan can't keep up with the cooling needs of the engine and the engine overheats. At this point, replacement is often necessary.
Other signs of fan cluch failure would include any looseness in the clutch (check for fan wobble), or oil streaks radiating outward from the clutch hub.
If the clutch is binding, the fan may not release causing excessive cooling and noise, especially at highway speeds


A good clutch should offer a certain amount of resistance when spun by hand (engine off, of course!). But if the fan spins with little resistance (more than 1 to 1-1/2 turns), the fan clutch is slipping too much and needs to be replaced.
If the fan binds, does not turn or offers a lot of resistance, it has seized and also needs to be replaced.
Fan speed can also be checked with an optical tachometer, by marking one of the fan blades with chalk and using a timing light to observe speed changes, and/or listening for changes in fan noise as engine speed changes.
You should also try to wiggle the fan blades by hand. If there is any wobble in the fan, there is a bad bearing in the fan clutch, or a worn bearing on the water pump shaft. A bad water pump bearing will usually cause the water pump to leak and/or make noise, but not always. Remove the fan clutch and see if the play is in the water pump shaft. If it feels tight (no play or wobble), replace the fan clutch.


Many experts say it is a good idea to replace the fan clutch at the same time as the water pump if the water pump has failed. The reason is because both age at about the same rate, so if the water pump has failed, the fan clutch may also fail soon. As as we mentioned earlier, a high mileage fan clutch may be slipping excessively increasing the risk of overheating.
When you buy a replacement fan clutch, make sure you get the same type (thermal or nonthermal) as the original. You can always upgrade from a nonthermal to a more efficient thermal fan clutch, but never the reverse. Or, you can get rid of the fan and clutch altogether and install an aftermarket electric fan kit to cool the radiator.

Sep 28, 2016 | Ford Cars & Trucks

1 Answer

Why clutch fan on my bmw e90 330i is making noise

Can you wiggle the fan front to back when the engine is off? If so, check to see whether it is the water pump or the fan clutch and replace as required....

Sep 17, 2014 | BMW 330i Cars & Trucks

1 Answer

Fan clutch pulley is making alot of noise, I was able to move the fan and it did give to a wiggle back and forth, it makes noises when the car is on, I am at a lost : any advice, comments, or answers will...

Problem could be either the fan clutch or the water pump, neither part should have any play in it. If the noise is like a jet engine, it is likely the fan clutch.

Oct 05, 2011 | 2005 Chevrolet Trailblazer Ext

1 Answer

Clutch fan making lots of noise, always the same, sounds like metallic grinding noise

could be a bad clutch fan(?) -- BUT note that the clutch fan is attached to the water pump and if I was to guess without seeing the vehicle with my own eyes -- I would say that the sound is a water pump bearing that is bad and it is time to replace the water pump.


Feb 06, 2011 | 1989 Chevrolet G20

1 Answer

I use alot of water..i changed my intake 3 months ago..i dnt see any water from weep hole..i did see my fan stop and start again..when i crank it makes a rubbing noise by that fan and a chirping...

I would replace the fan clutch and see if that fixed it. You can check the water pump shaft after you switch fan clutches. Your water loss can be from overheating. Some Service stations have Radiator pressure testers and you might have your cap tested too.

Sometimes you can borrow tools from Autozone or Oreillys with a refundable deposit.

Nov 18, 2010 | 1997 Mercury Grand Marquis

2 Answers

My trailblazer is making a grinding noise where the fan goes into the motor and it is loose

the fan clutch may be bad, very common, but check the water pump also. Fan clutch failure is common, you may be ahead to replace that if the pump is bad.

Nov 16, 2010 | 2005 Chevrolet TrailBlazer

1 Answer

Pulley making noise, little paly in it fan clutch?

Shut the engine off and let it cool down. Then reach in and try to turn the fan. It should move smoothly with some resistance. If it's loose, doesn't move smoothly, or just spins easily. It's time to change it. It is threaded onto the water pump and takes a semi special tool to unbolt. Also, it's a left hand thread. What concerns me though is that you say the pulley is making noise. If it's making noise, and there's "play" in it. It very well may be the water pump.

Feb 28, 2010 | 2003 GMC Envoy

1 Answer

Fan clutch is wobbly and making a noice

You should replace the fan clutch. Unbolt it from the water pump and pull cluth and fan out together. Unbolt fan blade making note of blade angles, so you install it right on new clutch. Bolt fan on new clutch and reinstall unit. When the clutch has play or wobbles it is time to replace it before it breaks off and goes thru the radiator.

Nov 08, 2009 | 2000 Dodge Dakota Quad Cab

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