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Vacuum Leak that goes away with A/C?

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Old 04-25-2012, 08:33 AM
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Default Vacuum Leak that goes away with A/C?

Hello All,
I have an '01 SS that is relatively stock (different cam, nothing radical). It has A LOT of miles on it. It sounds like I have a vacuum leak in idle, sounds quieter with some throttle. But, it goes away completely when I turn on the A/C. I just recently replaced the A/C tensioner and it sounded alright when I was done with that. Don't know if that has anything to do with it but I'm lost. Any thoughts?
Old 04-25-2012, 09:45 AM
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The only thing I could possibly think of would be the vacuum line on the back of the intake for Hvac and AC. You could check that for small holes or something. It is in the back and connects on the passenger side, considering you have an 01 I believe it branches off into a t-fitting as well
Old 04-25-2012, 05:57 PM
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Thanks, I appreciate it! I'll check it out and see.
Old 04-25-2012, 06:36 PM
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if your HVAC controls work then the leak shouldnt be in the vacuum line or maybe the blend door actuator is FUBAR somehow. Or maybe the A/C idle up function is masking the leak when turning on the A/C




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