Put a new Klima relay in my 91 300D on Monday. AC fixed. I enjoyed cool air until halfway to work this morning. Driving along and suddenly, no cool air. Before I went into work I was able to verify the compressor clutch was not engaging (which was the symptom prior to replacing the klima).

I plan on checking the pressure switch this weekend, but my primary concern is that something has shorted and blown the new klima. I'm going to do an autopsy on the old relay.

So, is there anything in the circuitry of the ac system that could short out and blow a klima relay?

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1991 300D 2.5 "Rocinante"
2002 Golf TDI "Teen Spirit"
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1984 300D
1966 Mustang I6 3sp
1985 Mazda RX-7 GSLSE
1982 Toyota Supra
1977 Datsun 280z
1971 Datsun 240z