GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 7 of 7

Thread: A/C failure?

  1. #1

    Default A/C failure?

    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. #2
    Legend
    stephan's Avatar
    Join Date
    Sep 2010
    Location
    Far West, Oregon USA,
    Posts
    8,610
    Blog Entries
    1

    Default

    Do you mean "doesn't blow at all" from the front, or "doesn't blow cold"?
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol


  3. #3

    Default

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

  4. #4
    Legend
    stephan's Avatar
    Join Date
    Sep 2010
    Location
    Far West, Oregon USA,
    Posts
    8,610
    Blog Entries
    1

    Default

    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 by stephan; 02-27-2011 at 01:40 AM.

  5. #5

    Default

    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. #6
    Legend
    stephan's Avatar
    Join Date
    Sep 2010
    Location
    Far West, Oregon USA,
    Posts
    8,610
    Blog Entries
    1

    Default

    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. #7
    Sr. Engineer
    Join Date
    Aug 2009
    Location
    Virginia Beach, VA.
    Posts
    337

    Default

    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. ;)

Similar Threads

  1. pc failure
    By cascott325 in forum Games Forum
    Replies: 21
    Last: 11-01-2011, 09:03 PM
  2. OBD II Power failure
    By k.daddy1 in forum GM Powertrain
    Replies: 3
    Last: 08-26-2010, 02:33 PM
  3. Torsion Bar failure
    By The_Duke in forum Lifted & Offroad Suspension
    Replies: 14
    Last: 04-13-2010, 04:38 PM
  4. sad failure
    By blansho in forum Photo & Video Gallery
    Replies: 8
    Last: 12-18-2009, 08:54 AM
  5. Serious Brake Failure
    By cdvntx in forum Lifted & Offroad Suspension
    Replies: 8
    Last: 07-08-2009, 08:14 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •