Why is my car making this noise?

Asked by Jul 15, 2014 at 05:02 AM about the 2002 Buick Park Avenue FWD

Question type: Maintenance & Repair

My Buick is making a louder, high pitched squeal from the engine (A 3.8 Liter V6) when
I start it up, however when I turn my A/C on, or when the car is in gear and ready to
start moving, the noise is just, gone. After the A/C is turned off, or the car is back in
park, the noise comes back. After a short drive the noise is dampened, not as High
pitched and not as loud, but still there. It worries me to no end and I want to get this
noise fixed as soon as I can. My friends dad, who was a mechanic for well over 20
years suggest it's the Belt or the Harmonizer, but second opinions are always
appreciated.

1 Answer

286,025

Since it goes away when the AC is on, the AC compressor kicks on, putting more pressure on the belt. My guess would be a stretched/worn belt, and or belt tensioner and or pulley making the noise.

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