Question about 2004 Chevrolet TrailBlazer

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The fan on my 04 trailblazer wobbles/knocks. Its not the

The fan on my 04 trailblazer wobbles. Its not the clutch. It appears that a bearing is loose. You can grab the fan and shake it from front to back. How do I take the fan and hub apart to change the bearing?

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  • Chevrolet Master
  • 14,036 Answers

CHECK TO SEE IF FAN TIGHT TO THE CLUTCH IF YES YOUR FAN CLUTCH IS BAD.REPLACE IT.CANT REPLACE BEARING.

Posted on Jan 31, 2010

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Posted on Jan 02, 2017

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I have been hearing a cricket like noise ! 1995 v10 . Today thing got louder . Sounds like it could be the fan clutch.I checked the pulleys they all seem good . How do you check the fan clutch ?


When you said you checked the pulleys, did you take the belt off so you could spin them? To check for rough or loose/side play/wobble in the bearings. While the belt is off the tensioner make sure the tensioner has full and free movement. Buy a can of belt dressing, see if that makes the chirpping go away. It does on my 05 trailblazer, for a few days. I think my belt is bad, in that it tracks back and forth on the smooth back pulley while the engine is running.

Feb 22, 2017 | Cars & Trucks

1 Answer

P0495 & p0128


I am thinking you are on the right track. A noisy, wobbly fan has to be replaced and replacing the thermostat could reduce the fan speed as the problems are interrelated.

Nov 15, 2013 | 2005 Chevrolet TrailBlazer

1 Answer

Fan is wobbling,checked 4 bolts and they are tight


the water pump bearing is bad and making the cooling fan wobble. need to replace the water pump before it starts to leak.

Aug 13, 2011 | 2004 Chevrolet TrailBlazer

2 Answers

My fan is wobbly and it makes a knocking sound when I drive. When I'm stopped or idling it's louder and the engine seems like it's going to shut off. What can be wrong?


If the fan is wobbling, even if the engine was running well, you should fix that. Either the fan clutch has failed or the water pump bearing is bad.
If it comes apart, it will do more damage and cost way more $ to repair.
Other running problem may or may not be related but do that first!!

May 27, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

When trailblazer is on, i hear a loud squeeking sound. when checking engine i noticed that the radiator cooling fan and pulley move up and down. does not seem to be wobbling at all just moving up and down....


Sounds like your fan clutch is going bad. If you can move the fan by hand then I recommend changing the fan clutch. If it completely fails your fan will be shot through your radiator.

Apr 22, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

The winning sound that gets louder with the acceleration could that be coming from a wobbly fan clutch, fan does not wobble when truck is off


If it's an engine related sound....it should be there when the truck is stopped...(running....not moving).
If it starts when the truck starts moving it's a 90% chance it is a bearing.
60% wheel bearing........20% rear end bearing....10% other.

Aug 17, 2009 | 2005 Chevrolet Trailblazer Ext

1 Answer

Are there bearings in the fan that can go bad? how hard is it to replace the fon or said bearings


The fan clutch does have bearings but it is not usual for them to go bad. Rumbling in that area is usually the water pump or the idler pulley. Use a mechanics stethoscope to determine where the noise is coming from.

The fan clutch is a tricky repair if you are a novice. The fan shroud is the biggest problem, it's one piece, THANKS GM. I remove the fan after knocking the fan clutch loose. Then I remove the upper radiator hose, the tranny cooler lines from the shroud, and then i will remove the fan clutch.

To remove the clutch the shroud will have to be lifted upward. There is a plastic shield on each side of the shroud that has to be let loose(not removed). Then lift the shroud up passing it by the radiator hose area and lifting the other side higher. You do not have to pull it out. just lift it high enough to get the clutch out. There is a wire harness on it that you can hang on to to help lift out the clutch. Be careful not to bang it off the radiator.

Aug 08, 2009 | 2005 Chevrolet TrailBlazer

1 Answer

The fan blade is loose & wobbles on the shaft on my dodge dakota


Fix it now or forever pick up the pieces...You have one of two problems possibly both...The fan clutch that the fan is bolted to has a bad bearing. replace it Or, the bearing in the water pump has failed. again...replace it. If fan clutch failed carefully check pump ...shaft bearing can be damaged by wobbling assembly. Seriously...don't ignore this if fan gets loose,it will damage far more than the problem you now have!!!
good luck!!

Mar 25, 2009 | 2000 Dodge Dakota Quad Cab

1 Answer

I HAVE 02 TRAILBLAZER LTZ, AND IT JUST STARTED MAKING A KNOCKING SOUND THAT SEEMS TO COME FROM ENGINE. THERS IS NO CHECK ENGINE LITE, IT IS NOT LOW ON OIL. YOU CAN HERE KNOCKING SOUND AT IDEL SPEED AND...


Hello, I see you have a trailblaber with a knocking noise. It sounds like you have an electric fan clutch issue. Believe it or not your vehicle has an electric fan clutch. It looks just like the older non-electric but if you look on the driver side of the fan shroud that is the wire connector you see. It is an exspensive part just for the clutch but thats exactly what you are describing. It doesn't get louder just fast with rpms. Please rate my answer, Thank you

Mar 06, 2009 | 2002 Chevrolet TrailBlazer

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