Quote:
Originally Posted by oilslick
Nobody else? Bump!
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That's the problem with these old A/C systems - too many electrical issues.
You really will need to get into the electrical to solve this or send to a shop.
If you want to check -
compressor speed sensor function and signal
Tach signal to KLIMA
KLIMA relay
Ground loss - -
just a start from my point of view.
Note that fuse 5 feeds much of the junk that the CCU talks to and the CCU and Monovalve.
Regarding the vacuum issue, check the vacuum control switches.
Do you have the factory service manual? You really need to get one if you don't want to shell out loads to the dealer or indy.
My AC (cooling) does a similar thing - compressor won't cut -in - occasionally , I'm just not going to get into right now. So , I shutdown the car, give it a few minutes - everything is fine for weeks - months.