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The A/C clutch hub is rubbing on your A/C pulley and the gap needs to be readjusted. When the A/C is off the hub free wheels with in the pulley. When the clutch energizes the hub and pulley spin together and eliminates the noise.

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14y ago
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Q: Why would a 97 Pontiac sunfire make a weird long noise while the car is on but when the ac comes on the noise goes away?
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