Q: Q: Ac compressor

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Car is making a knocking noise when I’m driving starts as soon as the car is cut on even without the a/c being on AutoZone guy says that the pulley on the AC compressor is worn down/broken. My question is do I need a whole new AC compressor or can I just buy the pulley and have a mechanic replace the old pulley with the new one? I don’t care if the a/c doesn’t work since it’s winter. Also should I stop driving the car until it’s fixed?

My car has 169000 miles.
My car has an automatic transmission.

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