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Jake Cheek
Jake Cheek,
Category: Chevy
Satisfied Customers: 26
Experience:  Automotive Technician at Hendrick Chevrolet
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04 trailblazer vibration. I have had several of these and I

Customer Question

04 trailblazer vibration. I have had several of these and I am familiar with the motor mounts and the sound of the vibration they cause. The noise I am hearing sounds just like that but I have replaced with new motor mounts and the noise has not gone away.
Submitted: 11 months ago.
Category: Chevy
Expert:  Jake Cheek replied 11 months ago.

Hi my name is***** you describe the noise? Is it metallic or a loud vibration?

While the engine is running open the hood and inspect the belt tensioner. Is it excessively vibrating back and forth? You can confirm it is the tensioner by removing the serpentine belt and running the engine for 30 to 40 seconds. Note - do not run the vehicle for extended time without the serpentine belt.

Other causes could be a bent water pump shaft or failed bearing, bent or cracked brackets, or bent fan clutch shaft. These should be visibly damaged so there are no tests.

I will be here when you respond with more information and the results of the test above.

Expert:  Jake Cheek replied 11 months ago.

The water pump bearings can be checked by wiggling the cooling fan, if play is felt the bearings are worn and may be making noise.