2002 Chevrolet TrailBlazer Logo
Posted on Apr 09, 2009
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I HEAR A LOUD WHINNING NOISE FROM UNDER THE HOOD

SEEMS LIKE FROM THE AC PUMP ,IS THERE A BEARING IN THE PUMP PULLY ? AIR STILL WORKS AND THE NOISE QUIETS DOWN WHEN THE AC SWITCHES ON OR OFF

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Harvey N Tawatao

Harvey N Tawatao

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  • Chevrolet Master 3,854 Answers
  • Posted on Apr 09, 2009
Harvey N Tawatao
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Yes there is a bearing in the AC clutch assembly, and the bearing can be changed with out swapping out for a whole new AC compressor unit or even taking the unit out. 
The other thing to you may want to check is the Serpentine belt tensioner. The tensioner then to break apart and or when the clutch activate put's more pressure on the system and the idler pully bearing could alsy be the problem. 
Spray some water on the fan belt whale the engine is running and see if the noise goes away and comes back as the water dry's. If the noise goes away then it's just a worn belt and need to be changed or you may want to do the quick fix and buy Fan belt dressing. 
Good luck and hope this helps

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  • Posted on Apr 09, 2009
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Try the idler pulleys-put a long screwdriver on the fixed part and the other end in your ear while running-it will transmit bearing noise

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  • Hi, I can help.
  • When your water pump goes bad it will begin to grind. I had one I let got far to long and it sounded deafening when I opened the hood. You can open your hood and listen and see for yourself. The water pump is on the belt line, left side under the hood, last pulley toward the rear.
  • Now if your asking can an oil change effect the water pump? No, not at all. Water pumps go sporadically.
  • It would be odd that you heard no noises before the oil change and now the water pump is loud enough to take notice after the oil change. The bearings usually go a little slower than that.

  • I would be interested in some more of the details to this. And what your overall concerns are. I'd be happy to further. help. Otherwise get a second opinion on your cars condition.


  • Hope this helps and thank you for using FixYa.

Regards, Tony
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