WHAT AUSES THE A/C MAKE A LOUD HUMMING SOUND ONLY ON HIGH SPEED

2002 Pontiac Firebird

Tiny

billmill5050

July, 13, 2012 AT 10:30 PM

1 more

Tiny

billmill5050

July, 13, 2012 AT 10:33 PM

Where did you get your diagrams at?

Tiny

billmill5050

July, 14, 2012 AT 12:13 AM

I ran ac it open & closes a door when u go from ac to max ac

Tiny

saturntech9

July, 14, 2012 AT 12:25 AM

Thats your recirculation door actuator.

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