RWD - 940 Electrical Issue - Dash Lights and No AC

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940 Electrical Issue - Dash Lights and No AC

A 93 940T. Everything was fine then 4 dash lights lit up: washer fluid, brake, parking brake and the battery. A moment later the AC stopped blowing cold (compressor disengaged). Washer fluid and brakes are all fine. I take battery lights more serious but am thinking the lamps could be a back feed from something else.

I found a similar situation on a 10yr old post from a general car site. Guy had his SRS light come on which in turn killed the AC. Blower works - just the compressor shuts off. He said that a couple weeks later while driving, the SRS lamp went off, and a moment later the AC came back on. Same issue - different dummy lights. The next day lamp was on, AC off, and thats where his posts ended.

From what I've read, this is a somewhat "common" problem, although I never heard of it. I noticed in the schematic that the D+ energizer wire at the alternator connects to the MCC controller, which might connect the battery lamp and the AC thing. I'm looking into common grounds, relays, feedback possibilities, etc. Belts, harmonic dampener, etc are all 3k from new NOS.

Any suggestions? TIA


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New 940 Electrical Issue - Dash Lights and No AC
posted by  Doppleganger  on Sun Aug 27 16:05 CST 2017 >

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