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Thread: 1989 chevy 1500 AC Vent problems, head blinks

  1. #1
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    1989 chevy 1500 AC Vent problems, head blinks

    Hi, I am having a problem with my vents not working right.
    The control unit (digital) just blinks at me for both
    the head/feet selection and hot and cold.

    I already replaced the control unit 2 times and that did not fix the problem.
    Someone told me it could be the actuator motors
    but i just tried one from a junk yard and it didn't change
    but i have no idea if it was any good or not.
    I didn't want to spend 88 bucks for a new one at the dealership for a blind check.

    When i select the hot/cold after the selector gets to a position that i select
    the motor still runs until it reaches full open or cold.

    Any ideas? i don't feel like pulling my whole dash and tracing every wire individually!
    Thanks
    Last edited by crabtruck; 04-25-2011 at 01:28 PM. Reason: title

  2. #2
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    Would anyone happen to have a wiring diagram for the HVAC system?
    I have one of those Haynes manuals but the wiring diagram in that
    does not correspond to the actual wire colors in the truck.
    Last edited by crabtruck; 04-25-2011 at 01:31 PM. Reason: code [cr]

  3. #3
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    I have the original wiring manual for an '89 GMC, should be the same.

  4. #4
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    could you post it please?

  5. #5
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    crabtruck's Avatar
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    When it does get posted, be sure to only use it as a guide.
    I have looked at hundreds of drawings and have seen very few
    that are correct. My favorite is when the publisher puts out
    a correction that changes the part that was not wrong.

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