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  1. #1
    Jr. Apprentice
    Join Date
    Oct 2008
    St. Johns, MI

    Exclamation HVAC controls not working '89

    Hi, i noticed on my 89 chevy pickup that my HVAC controls only half way work. the A/C button doesnt' do anything and neither does the defrost button. It doesn't even show it on the display and nothing comes out of the vents. I checked my fuses and they are all good. so is the control unit toast? or is there something else that could be wrong? i really need this fixed before i get caught with a frosted window! thanks
    1991 s10 2.8 v6 2wd, lowered 2/2 shaved door handles, pride and joy. Now wrecked :frown: time to fix again

    Make room for my '89 silverado :smile:

  2. #2
    Legend unplugged's Avatar
    Join Date
    Sep 2006
    High Deserts of SoCal


    Most likely the blower relays or the fan motor itself.
    Check out AutoZone's website for information on climate control parts.

    Here is a picture of the hi/lo relay:
    There is no way to happiness....happiness is the way.:yipi:  _vXMYypuKMJFw671uF2ZPhjez_j-atRmcjM2zQKpQi1JSsB75/burb1.JPG
    High Desert SoCal
    93 K1500 burb (personal) 350 AT 3" Lift 250K+
    02 Honda Civic LX
    Looking for a 1990's Miata for an engine swap

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