Hissing from HVAC panel.

[Midnight Specialist]

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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[Alex Brooks]

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

[David T]

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

[Midnight Specialist]

Turns fine and no difference in the sound of the hissing. It’s all the same. AC blows cold


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