Question about 2002 GMC Envoy

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I changed the fan clutch and water pump and still a clicking noise, What can I do to find the problem?

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  • GMC Master
  • 1,311 Answers

Remove the serpentine belt and run the engine to see if the noise is coming from one of the belt driven devices.

Posted on May 10, 2014

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Posted on Jan 02, 2017

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SOURCE: Pulling a fan clutch assembly from a GMC 4.3 water pump?

First remove the fan from the clutch. There should be four to six bolts holding the fan to the clutch. The clutch is held on to the pump with four bolts. remove the four bolts to remove the clutch. I've included a pic of the pump to indicate the four mounting holes. Not sure if the link will work.

http://www.1aauto.com/scripts/view_full_image.php?image_url=http://images.1aauto.com/EWP/1AEWP00011.jpg&description_id=1090439

Posted on Aug 10, 2009

perkins48
  • 14185 Answers

SOURCE: 2004 envoychanged the water pump, fan clutch, radiator, thermostat and it's still overheating .fan not running

Your cooling fan relay is bad.

Posted on Mar 24, 2013

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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

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

2006 trailblazer clicking noise


check obstruction values of the fan blade.
if it is not that use a mechanics stethoscope to listen for the source of the noise.

Jul 14, 2014 | 2006 Chevrolet Trailblazer Ext

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

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


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.

Feb 16, 2014 | 2002 GMC Envoy

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.

c...

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 ..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

Fan & shrould Broke off the water pump


I believe that the part your'e talking about is the clutch for the fan. It is a two piece unit, factory assembled. likely the bearing inside failed and caused this. You can change the fan and clutch unit, inspect everything for damage from the fan becoming disconnected and be OK, however running and wobbling may have caused some bearing damage in the pump...keep an eye on it...any noises or leaks from there, change it.

Mar 24, 2009 | 1995 Nissan Pathfinder

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