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  1. #1

    Default 92 suburban ac heater control

    Hello everyone, I am new to this site and hoping someone here can help me with my problem. I will try to make this as short as possible. My ac heater control quit working so I bought a new one , after installing it I had the same problem( no display, not functioning at all). I tried a few fixes I had read about,disconnected the batt cable , connect it back etc, no help. I looked at the wiring diagram on the alldata site and started checking for voltage at the connectors to the controller, I have no voltage at the red wire to the controller. I ran a jumper to it and it worked fine, so I know this is where my problem is. On the electrical diagram this wire runs back through some switches ( S130 and S158) but the diagram does not show where they are at. Has anyone else ran into this problem or can you tell me where these switches are located? Any help would be appreciated.

  2. #2
    Jr. Mechanic
    Join Date
    Dec 2009
    Deep River Ontario


    have you checked all the fuses?

  3. #3


    Yes, fuses are good, power on both sides

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