96 Deville, AC quits, idle goes crazy

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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 96 Deville, AC quits, idle goes crazy in Past Cadillac Vehicle Discussion; On occasion the ac stops cooloing (no compressor operation) no codes what so ever. At the same time the idle ...
  1. #1
    dlwoodtx is offline Cadillac Owners Member
    Automobile(s): 62 conv, 95 Deville
    Join Date
    Feb 2009

    96 Deville, AC quits, idle goes crazy

    On occasion the ac stops cooloing (no compressor operation) no codes what so ever. At the same time the idle goes way up, engine races to max RPMs if allowed. Again no codes. Pull over, leave in gear (to keep RPMs down) and restart and everything is fine. Got me stumped for sure.
    Idle controlled by ISC via PCM motor or not controlled by vacumm leak. AC controlled by AC controller via PCM. Beside the PCM is the any other things in common? Maybe joint wiring harness issues? Grounds. Any other ideas or known issues?

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  3. #2
    Dave S Texas's Avatar
    Dave S Texas is offline Cadillac Owners Enthusiast
    Automobile(s): '87 Coupe DeVille 4.1L FWD(New engine '08) 1981 F100 '03FXDL
    Join Date
    May 2008
    Austin(area), Tx

    Re: 96 Deville, AC quits, idle goes crazy

    Many bad things happening yet no codes?! I'd first suspect a faulty controller. You can try disconnecting the battery. This will erase the RAM and control will revert to the default program. If the bad behaviour returns I'd look at replacing the controller. Maybe someone has a different idea though.....

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