[Main C900 Bulletin Board | BBFAQ | Prev by Date | Next by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos A/C won't disengage- update... Like This Post: - Subscribe to Daily Digest for this Bulletin Board Posted by nicknick [Email] (#731) [Profile/Gallery] (more from nicknick) on Fri, 24 Jul 2009 23:10:37 Alert me when someone posts in this thread: Members do not see ads below this line. - Help Keep This Site Online - Signup

'88 SPG.
OK, recently installed used, unknown compressor. Last one failed, but behaved the same until it did.

A/C works just fine. Nice and cold, compressor and fans all work nicely.
However, when it cycles off, or if i switch off the A/C via the dash switch, it 'shushes' for a while, with the compressor wheel kind of freewheeling, obviously dragging somewhat.

Pulling the relay does nothing.

There is around 3.3v on the red lead with A/C off, engine running.In fact the voltage appears from the initiation of cranking.

it jumps to around 12v with A/C on (compressor engaged)

It drops down to around 4.5v with A/C turned back off ('shushing' at this point). The voltage creeps down to 3.3v or so, and at some point (or not) the compressor finally disengages.

I have just replaced (with known good) Electro magnet thing on top of compressor, A/C switch in dash, A/C relay in fuse box on fender, and of course the compressor is a different one to the last one that did the same thing (then smoked and died).

I can only deduce that the voltage that exists with the A/C off is not supposed to be there. i don't have another car with fiuncional A/C to compare.


Please help! I don't want to trash another compressor.

If i disconnect the

posted by 70.193.2...

• A/C won't disengage- update..., nicknick , Fri, 24 Jul 2009 23:10:37 <-- Viewing This Message
  • Re: A/C won't disengage- update..., Saabnutt, Sun, 26 Jul 2009 19:07:19
  • No Ground!!!! I had missed one ground connection, nicknick , Sat, 25 Jul 2009 17:33:30
    • Re: No Ground!!!! I had missed one ground connection, Simon S, Sun, 26 Jul 2009 18:51:20
  • REALLY stumped now!!!! could this voltage be coming, nicknick , Sat, 25 Jul 2009 15:27:03
  • If i disconnect the red wire-It does fully disengage-nm, nicknick , Fri, 24 Jul 2009 23:13:30
    • Re: If i disconnect the red wire-It does fully disengage-nm, Simon S, Sat, 25 Jul 2009 09:11:20
      • Thanks! I have a spare, i'll try it later. nm, nicknick , Sat, 25 Jul 2009 09:49:22

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