Results 1 to 6 of 6

compressor craziness

This is a discussion on compressor craziness within the General Help forums, part of the LSx Technical Help Section category; Hey guys, i'm havin some compressor problems and i was wondering if ya'll could shed some light on this... I ...

  1. #1
    Junior Member abarthle's Avatar
    Join Date
    Jan 2007
    Location
    Tampa
    Posts
    31

    White
    94 Firebird Forumula

    compressor craziness

    Hey guys, i'm havin some compressor problems and i was wondering if ya'll could shed some light on this...

    I have a '94 Firebird Formula, 350 LT1 and all the sudden today i stop getting cold air. I've checked all fuses, and their good. The static pressure levels on the high and low sides when the car is off. Freon is in good shape. Now the real screwy part is i plugged in my OBD I scanner in to see if it would flash any codes, for one thing no codes flashed, the light never came on at all. However when the scanner was plugged in and the key on start, the compressor would come on, so i tried to start it up with the scanner in, and immediately the compressor turned off. For some reason the PCM or something is telling the compressor to turn off whenever the car is started. I'm not sure what to touch, whether to replace the compressor or look at getting a new PCM. The electronics have been screwy in this car since day one. I went to a dealer mechanic buddy for a free look at it, he plugged in his OBD I scanner, not just a code flasher, and he got no readings, he couldn't clear codes or change any settings what so ever.

    Any idea what might be causing my electronic/compressor struggles?
    i'm hopin someone has had experiance with this system and can lend any thoughts.

    Thanks alot guys.

  2. #2
    Orig Regist: 9/98
    Join Date
    Sep 2005
    Location
    NE Indiana
    Posts
    535

    Black
    1998 Trans Am WS6 'Vert

    However when the scanner was plugged in and the key on start, the compressor would come on, so i tried to start it up with the scanner in, and immediately the compressor turned off. For some reason the PCM or something is telling the compressor to turn off whenever the car is started.
    First off, I'd like to know how you know the compressor is "ON" when the engine is "OFF"?? Measuring the voltage at the compressor clutch w/ the engine OFF and ignition ON?

    In any case, if your compressor is cycling ON and OFF for no apparent reason, your freon is probably low. There is a pressure sensor on the suction side of the compressor, if the pressure isn't high enough it will cut-off the compressor. When the freon is low, as soon as the compressor comes on, it sucks down the pressure on the suction side too much and the switch turns the compressor OFF, then after a while when the pressure re-balances, the switch will turn the compressor back on and the cycle repeats. Checking codes won't tell you jack about the pressure in your refridgerant system, you need a R146a refill kit w/ pressure guage. Re-charge it and you should be golden.

    Johnny B - '98 "Triple Black" WS6 Convert, M6, All Options, ASC #3030 (1 of 50)
    KBDDSFC, DGM C/F Tonneau, MTI C/F Lid, K&N, HPP-III, 160 T-stat, Pro 5.0
    Link to Firebird Production Breakdowns

  3. #3
    Junior Member abarthle's Avatar
    Join Date
    Jan 2007
    Location
    Tampa
    Posts
    31

    White
    94 Firebird Forumula

    i've checked the freon with gages, and as i said in my post it's fine, 110 psi on high and low side. i'm thinking its the ECM, cuz i've never been able to get any codes from the computer and it's just been screwy since day 1 so my thinking is the kid i bought it from prob tried to either chip it or used something on the computer and screwed somethin up in there.

    any more suggestions?

  4. #4
    Junior Member abarthle's Avatar
    Join Date
    Jan 2007
    Location
    Tampa
    Posts
    31

    White
    94 Firebird Forumula

    hey i got it fixed, i grounded the relay in the fuse box with the car running and there the compressor turned on and had cold air, so i concluded it was the computer's fault for not grounding it. i pulled out sensor on AC lines and disconnected computer sprayed WD40 on the contacts and reconnected the computer and AC sensor and bam ice cold air.

    thanks anyways guys.

  5. #5
    Junior Member Cheviac2K's Avatar
    Join Date
    May 2008
    Location
    Columbia,SC
    Posts
    30

    Arctic White
    2000 Trans Am & 2000 C5

    So you're getting 12s from the ECM now? If not I'd keep the investigation open.

  6. #6
    Junior Member abarthle's Avatar
    Join Date
    Jan 2007
    Location
    Tampa
    Posts
    31

    White
    94 Firebird Forumula

    actually i'm not, still getting no codes from the computer and my air bag light randomly came on. Perhaps i should just look around on the internet for a new computer and be done with it. Obviously it's having problems with some things so i should just replace the piece of crap.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Compressor Craziness
    By abarthle in forum General Help
    Replies: 0
    Last Post: 06-29-2008, 06:10 PM
  2. A/C compressor for 94 Z28
    By axcellclan in forum Parts Wanted / Trade
    Replies: 0
    Last Post: 05-22-2007, 05:00 PM
  3. Ps3 Craziness
    By Phlash_riot in forum Almost Anything Goes
    Replies: 4
    Last Post: 11-17-2006, 11:58 AM
  4. 5th Gear Craziness
    By Rokn Red in forum Manual Transmission
    Replies: 1
    Last Post: 06-07-2006, 05:34 AM
  5. More Muy Thai craziness with Tony Jaa *video*
    By Warbird in forum Almost Anything Goes
    Replies: 0
    Last Post: 05-21-2006, 09:21 PM

Bookmarks

Posting Permissions

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