Will whine in all gears, but most noticable at 18 mph in second, 30 mph in third, and 38 mph in fourth. Stops immediately when the compressor kicks out or A/C is turned off.
If it is coming from under the hood(whine)then the ac compressor is either low on oil,or it is about to go out.Sometimes ac compressors will last a good long time,but sometimes they whine right before they lock up.So look for some ac compressor problems.Have a mechanic check it out,but it will most likely need to be changed out(compressor and components).
go for it.
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This was my thought too. However, when I took it into the Buick Dealer today, the mechanic thought it might be a throttle-body "whistle". After spending some time with it, I got a call back saying that the mechanic had found a TSB indicating that the suction-side hose to the compressor should be replaced. The TSB also indicated that the compressor should definitely not be replaced. My guess is that the suction-side hose has been re-engineered because it was found to be restricting the flow of freon, which created the excess noise. Any additional thoughts?
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