Sounds like a loose belt, maybe due to a bad tensioner. A circuit monitors the RPM of the A/C compressor and shuts it off after a sudden change (such as a slapping belt.) Turning the car off, and then back on, resets this. Pardon the late-hours reply, Andrew Seidel.
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89 190E 2.6
83 300TD Turbo
75 240D
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