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Thread: Hissing from HVAC panel.

  1. #1
    Member Midnight Specialist's Avatar
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    Hissing from HVAC panel.

    I was using the AC today and also installed the Wings-A-Ligh Headlight Switch Bypass Kit behind the LMS. Now there is a hissing coming from the panel when I start the car. Would anyone have an idea what is causing it?


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    Last edited by Midnight Specialist; 03-17-2021 at 07:57 PM.

  2. #2
    Senior Member Alex Brooks's Avatar
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    Quote Originally Posted by Midnight Specialist View Post
    I was using the AC today and also installed the Wings-A-Ligh Headlight Switch Bypass Kit behind the LMS. Now there is a hissing coming from the panel when I start the car. Would anyone have an idea what is causing it?


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    Open it back up sounds like you knocked a vacuum line loose
    Alex Brooks

  3. #3
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    That or your mode switch needs to be rebuilt. When you turn it does it change the hissing noise? Is it hard to turn?
    David Teitelbaum

  4. #4
    Member Midnight Specialist's Avatar
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    Turns fine and no difference in the sound of the hissing. It’s all the same. AC blows cold


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