A/C failure?

Discussion in 'General Chevy & GM Tech Questions' started by black15belt, Feb 26, 2011.

  1. black15belt

    black15belt New Member

    hello all!
    i have a 1991 chevy burb that runs like a champ but is very moody. the other day the a/c was working fine and blowing as cold as ever. but when i restarted it, the A/C no longer worked. the rear blows just fine, but the front does not blow at all. i checked all of the fuses and they are all fine. any ideas? why would it just quit all of a sudden?
  2. stephan

    stephan Rockstar 4 Years 5000 Posts

    Do you mean "doesn't blow at all" from the front, or "doesn't blow cold"?
  3. black15belt

    black15belt New Member

    nothing comes out. cold nor hot. nothing. but the rear works just fine
  4. stephan

    stephan Rockstar 4 Years 5000 Posts

    No air comes out of the vents & you can not hear the fan running?
    If this is correct & you're sure you are checking the right fuse, then it's probably the blower motor resistor, but I would check your owners manual & be sure you are checking the correct fuse.
    * Also, don't just look at it to see if it's good, test it. You don't want to do a motor resistor if it's just a bad fuse.
    Last edited: Feb 27, 2011
  5. black15belt

    black15belt New Member

    The front fan doesnt turn on at all. I double checked and tested all fuses and replaced those for the a/c. How do I test and/or replace a motor resistor?
  6. stephan

    stephan Rockstar 4 Years 5000 Posts

    Replacing the resistor is a PIA so I would check the fan switch first just to make sure. Check & see that you have power to it & through it. It's probably good because 6 or 8 resistors fail for every switch, but just to be safe & possibly save some work.
  7. MightyMax

    MightyMax Rockstar 100 Posts

    My truck does this also.
    The fan will not come on.....I put it to Low, Med or High, and the fan will not spin up.

    So I take a wrench I have in the truck, and knock the area where the fan is located and that gets it going..... :D

    I am guessing a loose connection or something, so I will eventually get down there and take a closer look, but for now knocking it w/ a wrench works good. ;)

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