I agree with your situation. It if works all of the time with the test relay, then its got to be the Klima. Simple. How long do you think the test relay can be left in ?

1. Mine will NOT to work consistantly with the Simple relay. Had to fool with the A/C button to get the comp to work.
2. Put the Klima back in, works again, but still have to fiddle with the A/C button.

I know this doesn't mean the Klima is good but, I'm leaning towards the buttons on mine.

I'm going to drive it, and not touch buttons for a long time and see if it cuts out. This may be indicative of a time vs. hot temp Kilma thing. Of course vibration could jar the buttons or the relay and I'll be back where I started from.

Klima is silicone sealed. I can't get into it. A schematic would be nice, to find a circuit breaker if one exists. But, you'd think a fuse would blow first.

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1986 SDL
My Other Car is a Porsche. When it stops leaking, I'm out of oil.