Thread: HVAC vacuum diagram? 98 GTP

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  1. #1 HVAC vacuum diagram? 98 GTP 
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    Hey guys. New owner of a 98 GTP. Trying to get the HVAC controls situated since air only blows out of the defrost. Thinking it's a vacuum line somewhere. Are there any of those diagrams around or maybe someone could point me in the right direction to look? Any help would be greatly appreciated.
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  2. #2 Re: HVAC vacuum diagram? 98 GTP 
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    If you look at this pic, the top of the supercharger is a vacuum tree there are 3 lines, one goes to the brake booster, one goes to the bypass solenoid and the middle one that says to acsry, is the one you need to trace and find the leak in. It is not fun as it goes around behind the battery then into the wire harness before going into the vehicle.
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  3. #3 Re: HVAC vacuum diagram? 98 GTP 
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    Everything top side looked good but found a broken tab where I circled. Would that make any difference?
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  4. #4 Re: HVAC vacuum diagram? 98 GTP 
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    Quote Originally Posted by Quickbird144 View Post
    Everything top side looked good but found a broken tab where I circled. Would that make any difference?
    It might, but I think you would see other issues.
    So you checked out the vac line that is in the wire loom all the way to where it goes into the wire harness?
    2003 Redfire Metallic Chevy Tahoe Z71 - Airaid Modular Intake Tube, Flowmaster Exhaust.
    Quote Originally Posted by The Sunfire Guy
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