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Thread: Hissing from HVAC panel?

  1. #1
    Member Midnight Specialist's Avatar
    Join Date:  Jul 2020

    Location:  Boston

    Posts:    79

    My VIN:    02260

    Club(s):   (DMA)

    Hissing from HVAC panel?

    I turned on the AC earlier today and after turning it off there is a hissing noise coming from the HVAC panel. Anyone know what this might be?

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  2. #2
    Senior Member
    Join Date:  May 2011

    Location:  kansas city

    Posts:    480

    My VIN:    15275

    the mode switch..

    you need a rebuild kit for it most likely

  3. #3
    Senior Member Rich's Avatar
    Join Date:  May 2011

    Location:  San Francisco Bay Area, Calif.

    Posts:    1,827

    My VIN:    0934

    Club(s):   (NCDMC) (DCUK)


    The mode switch diaphragm is a known wear item.

    A. Read the DMCH Knowledge Base article about what failed (the rubber diaphragm).

    B. Buy and install one of these Mode Switch Repair Kits.

    The kit has detailed access and teardown/rebuild instructions.
    March '81, 5-speed, black interior

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