Thanks Thanks:  0
Likes Likes:  0
Dislikes Dislikes:  0
Results 1 to 2 of 2
  1. #1
    New Member
    Join Date
    Mar 2009
    new hampshire
    1990 c4 burgandy
    Post Thanks / Like

    Default help with wiring problem

    I have a 1990 coupe. I am having a problem with the dash and a/c control. When i put the key in ignition, dash display and a/c control work normal . As soon as i start the engine , the dash goes crazy and a/c control does not respond. I have replaced the ccm module last year and checked all the grounds that i could find. I was driving on interstate when this probl;em started right out of the blue. Any help or thoughts on this will be helpful . Thank you

  2. #2
    Join Date
    Feb 2008
    2007 Monterey Red
    Post Thanks / Like


    Hi and welcome to the forum!

    It sounds like something is loose. Think about what you said. It is fine with the key in the ignition, (by that I mean turned to the on but not run position?) and when you start it up it does that. It sounds like when the engine is running, a vibration might be making a wire or terminal or ground go intermittently open. Do you have a factory service manual, better known as an FSM? I have a 94 so I do not know if the wiring diagrams might be related.

    Another thing to think about is corrosion. If it spent its life in New Hampshire (I used to live in Boston but I'm okay now ) and if it was anywhere near the coast the salt water in the air can raise riot with electrical contacts.

    When you say dash do you mean the speedo display? Or something else? See if there is something related.

    I would try to do as much as I could without tools first. For instance, you could remove the fuse for the A/C control and see what happens.

    Best of luck and keep us informed.


Similar Threads

  1. Replies: 12
    Last Post: 05-14-07, 08:53 AM
  2. 84 Wiper Motor Problem
    By SteveF in forum C4 Technical and Performance
    Replies: 1
    Last Post: 03-02-04, 09:08 PM
  3. Wiring harness problem..
    By wicky88s1975 in forum C3 Technical and Performance
    Replies: 5
    Last Post: 02-24-04, 10:41 PM
  4. c5 headlight problem
    By bsouth in forum C5 Technical and Performance
    Replies: 9
    Last Post: 02-05-04, 08:08 PM
  5. 1968 corvette with overheating problem
    By mgms_1968 in forum C3 Technical and Performance
    Replies: 20
    Last Post: 02-03-03, 02:04 PM

Posting Permissions

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