Question about 2002 Chevrolet TrailBlazer

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I have a whining noise at at speeds over 30 mph and in park if u rev the engine also at the same time no a/c

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You need to inspect your Serpentine Belt. That is the ribbed belt <see diagram below> that is driven by the engine's Main Pulley at the crank (generally, lower part of the engine). The smooth side usually drives the water pump, while the ribbed side drives the alternator, power steering pump, and air conditioning compressor. Inspect this belt and look for obvious signs of oil (slick stains) that have dripped onto the belt from another part of the engine. If you have oil stains, then you will need to get the source of the oil leak fixed before replacing the belt because you would otherwise be throwing money away as a new belt would soon experience problems due to the oil leak. If no oil leak, check for obvious wear on the belt by looking for BIG cracks that are penetrating through to the smooth side of the belt, cracks parallel to the smooth side of the belt, or chunks missing from the ribbed side of the belt <see diagram below, though the bottom diagram shows cracks perpendicular to the backing that are normal/acceptable; Parallel cracks soon become chunks missing from the belt>

i have a whining noise at at speeds over 30 mph - badbelt2.gif If your serpentine belt is cracked or has chunks missing, it needs replacement.

Posted on Jul 19, 2009

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