Question about 2002 GMC Envoy

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New fan clutch making clicking noise, what can cause this problem?

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There is a bearing in the fan clutch and it may be faulty. check that the fan blades are not touching on the shroud . Check that the water pump bearing is good.

Posted on Feb 16, 2014

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Posted on Jan 02, 2017

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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.

FAN CLUTCH PROBLEMS

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

CHECKING THE FAN CLUTCH

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.

FAN CLUTCH REPLACEMENT

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

2 Answers

Replaced fan clutch and and the problem is still their. reeves up when you start off. and u can here the fan


This would be normal. As there isn't air flow , then the fan starts turning to get up to speed. The noise is from the fan blades flexing and pulling air threw the radiator. The blades could be a little fatigued. They should have check for cracks when the clutch was replaced. Cracks make the noise worse.

Dec 11, 2014 | 2003 GMC Envoy

1 Answer

1997 mercury mountaineer afte installing fan clutch still make noise


With belt off spin pulleys and feel for slop. Bearing going bad?

Aug 26, 2014 | 1997 Mercury Mountaineer

2 Answers

My engine is making clicking noises when I start it. This lasts for about 10 minutes.


Sounds like a lifter hasn't pumped up . Put an additive in the engine oil that quiets noisy lifters. Any auto parts store or even walmart has it.

Apr 20, 2014 | 2004 GMC Envoy

1 Answer

Replace flan clutch and water pump and alternator but still makes a clicking noise, what can cause this problem?


A brand new out of the box fan clutch did this to me. Ticks are driving me crazy. It's probably your new fan clutch unfortunately. Mine was purchased at Autozone if this helps.

Feb 16, 2014 | 2002 GMC Envoy

1 Answer

I have this vibrations around my fan clutch and some time it sounds like something is clicking or tapping.


The clicking is generally caused by a flat roller bearing. If the sound seems to be from the fan clutch you can grab the fan blades and see if the bearing is worn by rocking the blade by pulling it towards you and rockng it away from you
Another way to see if its bad is to use a solid pole something like a broom handle. Place one end of the handle on the accessory that runs off the serpentine belt such as the alternator and place your ear on the other end of the handle. As the engine runs you can hear a bearing making noise revolving as it move. If a bearing is bad the noise will be much louder and have a heavy grinding noise

Sep 28, 2011 | 2003 Chevrolet TrailBlazer

2 Answers

2004 gmc envoy engine tapping sound, it has plenty of water/antifreeze, and plenty of oil.


We have the same tapping sound on our 2003 Envoy six cylinder engine. I believe the sound is coming from the radiator fan clutch assembly. When the engine reaches its operating temperature and the fan clutch engages, the tapping sound goes away.

Jan 14, 2010 | 2003 GMC Envoy

2 Answers

I just installed a clutch fan into my 2004 dodge durango and now the suv runs so heavy. I mean the suv runs loud. Is this normal?


Not sure what you mean by "heavy" and "loud"..

The fan might be "louder" because it may have been allot more quiet with the old failing fan clutch and not spinning fast enough.. Thus the new one working correctly making the fan spin much faster and being "louder"..
If that makes sense - to you question..

Sep 25, 2009 | 2004 Dodge Durango

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