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91 745t a/c - clutch won't kick on - 12v @ low pressure switch? 700 1991

We have a 91 745t w/non-functioning air.

The compressor clutch activates when jumpered with 12v.
Jumpering at the low pressure switch has no effect.
There is not 12v @ low pressure swich.
I have tried 3 different MCC control units, all of which have had solder joints reflowed (that was an issue when we first got the car 3 years ago. It was resolved at the time, the other two MCC I do not know if functional or not)
A/C related fuses are good as well.

Any ideas what to check for?

Thanks!
Matthew
San Antonio, TX






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New 91 745t a/c - clutch won't kick on - 12v @ low pressure switch? [700][1991]
posted by  m4ff3w  on Sat Jul 11 11:31 CST 2009 >


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