1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

A/C Clutch Engagement

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Old Aug 6, 2009 | 06:17 PM
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Smile A/C Clutch Engagement

Pulling code PO640 Quad Driver1 or Quad Driver4. Just replaced entire A/C System. Compressor,
Dryer, New Pigtail to Compressor, Compressor Pressure Switch. Checked all switches high/low psi, a/c relay switch. Sounds like PCM or wiring harness. I NEED WIRING SCHEMATIC OF A/C system 95 SE ID K. FACTORY MANUAL JUST SHOWS BLOCK DIAGRAMS. Mr. Bill Buttermore any help would be appreciated.
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Old Aug 6, 2009 | 08:56 PM
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There'* a good chance billboost will have this diagram. Send him a PM if he doesn't chime in here.
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Old Aug 7, 2009 | 05:35 AM
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Thanks Dan. any others are welcome to chime in. Its hot here : ).
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Old Aug 7, 2009 | 01:29 PM
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Each quad driver in your year drives three soleniods. If you have the FSM, then you will have the most data possible.

Take a look at the three things on that driver and let us know what it has on it. Most likely it'* one of them. If not.. you do have the flakey pcm.
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