Question about 2004 GMC Envoy

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The fan has free playin it

I can wiggle the fan and it moves in the hub

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New fan clutch is needed to repair this

Posted on Dec 14, 2012

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My Toyota hiace commuter 06 is overheating but no visible watter leeks to be found..the engine is working good so I don't think is the head gasket..any advice?


if it has a conventional fan driven by the belt , replace the viscous fan hub ( fan clutch)
if electric fans . fuses, relays and water coolant temp sensor to be checked
if the over heating occurs at stop lights , slow moving traffic, hard pulls in low gears , and you have a viscous fan hub , it will be the hub

Aug 25, 2016 | Toyota Cars & Trucks

1 Answer

My 2002 dodge Durango makes a loud roaring noise when I first start it in the morning. And does it when I drive. Its a little loud then the normal. What causing it?


check to see if it has a viscous fan hub. if so then it is the hub action doing what it is sup[posed to do. When the engine is shut down for a period of time the fluid is allowed to flow back to the drive section of the unit . ON start up it virtually locks the hub so that the fan is travelling at full engine rpm and the noise you hear is the air flow through the radiator After about 30 seconds to a minute the fluid is pumped back to the reservoir and the fan hub drive slips and the fan slows down and the noise goes. IT will come and go on a properly operating hub as the coolant temperature engages and disengages the hub drive . You should notice it at stop lights , slow moving traffic and hard work at high rpms.

Dec 17, 2014 | 2002 Dodge Durango

1 Answer

I need to know what the part is that the fan clutch bolts onto with 4 bolts on the shaft for a 1995 jeep grand Cherokee 4.0?


the fan is bolted to a viscous fan hub. It is designed to have silicone fluid in one half of the hub and when the engine starts cold it locks up and drives the fan until the fluid is pumped back to the other side or reservoir in the hub. It is held there and the fan now spins free When the radiator gets hot there is a bi-metallic strip that holds a valve cluse and this strip bends and allows the valve to open and the fluid is thrown by centrificale force back into the front section and the fan is then jammed because it gets more than it can pump back to the reservoir. The fan spins and draws air through the radiator and cools the coolant down. As the coolant cools down so the metal strip closes off the valve and the fan eventually free wheels again until the next stop where the action is repeated. . If your car has one of these hubs and it tends to over heat when stopped then the hub is the main cause and should be changed. The noise is the fan spinning until the fluid is moved out of the front section

Jan 01, 2014 | 1995 Jeep Grand Cherokee

1 Answer

Feels loose while driveing


Air pressure good in tires? Idler and pitman arms would get loose. Jack up front wheels and grab them on each side and wiggle them from side to side. Watch for movement in the steering linkage. Then grab wheel on top and bottom. Wiggle it again. If it moves then, you need a wheel bearing Hub assembly or ball joint.

Apr 09, 2013 | 1999 Chevrolet Suburban

1 Answer

I'm having problems unbolting the fan hub from the waterpump


I find that If i place a flat bladed screw driver under the nut next to the one I wish to undo and lay it across the hub I have an effective bar with which to hold the hub as I undo the bolts/nuts. Undo 1 and then move onto the next one and repeat the process.

Mar 14, 2013 | Cars & Trucks

1 Answer

My 1988 Oldsmobile toronado over heats while in park and running,what should I look for ?


Engine overheating when idleing is a clear indication that the fan is not working. If it is an electric fan check temp sensor /relay or seized fan motor. If it is a viscous fan hub drive replace the hub as it is locking up tro drive the fan when the engine gets hot. If the engine cools down when start moving it is certainly to be in this area that you should be looking. A viscous hub after you start cold and apply about 2000rpm should produce a lot of fan noise which will die away after a few minutes. If you have no noise a replacement may be in order

Feb 22, 2013 | Cars & Trucks

1 Answer

1996 olds aurora runs hot when idling or low speed normal at fast speed what could the problem be


If you have a viscous fan hub The one where the fan spins free on the water pump then the symptom you describe is a result of it not working any more. With the engine cold start the engine and run at around 2000rpm If the fan is working properly you will hear the air noise from the fan for a few seconds then the noise will dissapear as the fan slows down. When the engine is hot viscous fluid ( silicon ) is pumped from one side in the fan hub to the other creating drag which makes the fan spin and draw air through the radiator. If this is not happening then the fan is stalled by the load of trying to move air and as such the temp rises. As you move off the air flows through the radiator and the fan becomes useless until you stop again. Noemal fix is a new viscous hub. If you have electric fans check that they are working as planned

Jan 11, 2013 | 1996 Oldsmobile Aurora

1 Answer

Water leaking from radiator


If water pump is leaking anytime from bottom of water pump where hole is or fan blade will wobble when you grab hold of it and wiggle it and it moves. Replace water pump. If radiator is leaking you could try stop leak. It could work for a week or it could work for years otherwise find a low price on the internet and look for free shipping like advanced auto 20% off and free shipping

Nov 02, 2011 | 1997 Jeep Grand Cherokee

1 Answer

Whining sound coming from front tire


One or maybe both of the hubs have bearing problems. Lift the car and try to wiggle the tire holding the top and the bottom of the tire, If it moves its bad, It should be tight. The hub can still be bad if they are tight.

Lifting the car and running the engine in drive will not always help in hearing a noise because you take the load off of the tires. And its dangerous on jacks.

Dec 06, 2009 | 2003 Oldsmobile Alero

2 Answers

Abs brake problem


I found my solution on the web a few years ago. My 2002 RVS had permanent ABS lights and no ABS.

It was suggested to check the ABS electrical connections at the brake disks . There are quick connects there and I found a corroded connector on the front passenger side. My wife started the RVS and put it in gear. With the brake pedal pressed, I wiggled the connectors and the ABS light went "off and on" right away. I replaced the connector and it never happened again. It is likely 4 years ago.

Worth a try.

Dec 28, 2008 | 2002 Buick Rendezvous

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