Buick rendezvous noise on when ac is on but the compressor

[Jose]

I have a 02 buick rendezvous and i have an issue that when i turn the ac on it makes a moaning/grinding noise for seconds and then goes away it does it when i let go of the gas or turning, and feels like the abs pump starts working, it only does it with the ac on cause when i turn it off the noise goes away or when i dont use it it never does it, please help

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[Drew]

Well i’m pretty sure the only part that starts moving when the AC is turned on is the compressor, that’s certainly the only part that would be affected when getting off the throttle. So my logic would dictate it has to be he compressor making the noise, probably a bearing. That or the extra load the compressor puts on the belt is causing another pulley’s bearing to make noise. This would also explain why steering affects the noise, if the compressor and power steering pump share the same belt. I’m pretty certain it’s a bearing on something the serpentine belt is driving.

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