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  1. #1

    Default 1990 silverado defroster only working on driver side

    I have a 1990 Silverado regular cab and the defroster only blows on the driver side. Not really sure where to start on trying to correct the problem. Any ideas or thoughts are appreciated. I will try to provide as much information as I can.

  2. #2


    Check if the tube from the heater box to the defrost vent hasn't come loose or gotten clogged. If your 90 is like my 89, than the doors that direct heat around the cab are controled by cables, which may be loose. The newer vehicles are controled by servos instead of cables, and thats over my head.
    Check those things, or ask your question again in the General Tech section for a wider audience.

    Good luck,

    1999 Chevy K2500 Suburban 350
    K&N, reworked cai, Thrush cat-backs
    Vinyl, cranks, floor shift, and rear air!

  3. #3


    I will check those things and see how it goes. If that doesn't work out, I'll post in the general tech forum.

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