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2005 Chevy Tahoe Whining Noise at low RPM

Tiny
KGRACE35
  • MEMBER
  • 2005 CHEVROLET TAHOE
  • V8
  • 2WD
  • AUTOMATIC
  • 67,000 MILES
Just bought a used 2005 Tahoe. Truck seems to run good except that I notice a whining noise heard when in the drivers seat at low rpm after the truck is warm. It seems to occur at about 1200 RPM and it kinda sounds like a trumpet player playing a dull single note. Happens in any gear - when at about 1200 RPM and the engine is warm. Kinda sounds like it coming from the left front of the engine. Also hear a rattle / clicking sounds from the same area periodically.

Any ideas on what this could be and how to pinpoint/repair?

Thanks.
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Sunday, January 10th, 2010 AT 2:31 AM

6 Replies

Tiny
PEAR69
  • MECHANIC
  • 1,482 POSTS
There are several things it could be. Release tension on the serpentine belt and turn all engine pullys by hand. Check the A/C Compressor, make sure it turn freely, but pay close attention to the idler and tension pullys.
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Sunday, January 10th, 2010 AT 3:18 AM
Tiny
KGRACE35
  • MEMBER
  • 5 POSTS
Okay - will do. Will let the forum know the results.

Thanks again.
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Sunday, January 10th, 2010 AT 3:47 AM
Tiny
KGRACE35
  • MEMBER
  • 5 POSTS
I removed the primary serpentine belt and turned the pulleys by hand. All moved freely without making noise. The power steer pully has some resistance, but I would think this would be normal since it is turning a pump.

Any other ideas on things to check?

Thanks
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Monday, January 18th, 2010 AT 1:24 PM
Tiny
PEAR69
  • MECHANIC
  • 1,482 POSTS
Put the belt back on and start the engine. Then turn on the A/C. See if the sound changes when the compressor kicks in.
With the engine running - very carefully check the powersteering fluid for bubbles (you'll probably need a falshlight for this). If bubbles are present, then the pump may be leaking. Some resistance is normal - but bubbles are not.
With the belt off - check the water pump pully for side to side and up and down movement. There should be none. If there is change the pump.
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Monday, January 18th, 2010 AT 6:15 PM
Tiny
KGRACE35
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  • 5 POSTS
I'll check these things and update the forum with my findings.

Thanks.
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Monday, January 18th, 2010 AT 6:18 PM
Tiny
KGRACE35
  • MEMBER
  • 5 POSTS
The ac pully was driven by a second belt. Looked like this belt wrapped around the crank and a tensioner pully. Should I remove this belt and check these pulley's as well?

Thanks
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Monday, January 18th, 2010 AT 6:20 PM

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