1992 129 500SL

A few weeks ago I began noticing that my A/C clutch was not engaging after starting the car. A quick restart would always restore operation. The problem has progressed and it now doesn't work more than it works...

I checked the A/C Compressor Clutch fuse.
The belt tensioner is good and there is no slippage.

What is left? The Climate control unit, some wiring and perhaps a relay or two?

Does this car have a Klima Relay?

I know my 92 400E had trouble with the wiring to a resistor related to a cooling fan that prevented the A/C clutch from engaging. Does any of that apply to this car?

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02 S500
92 500SL
92 400E (Sold)
87 300E (Sold)
83 300D Turbo (Sold)
75 300D (Sold)
74 240D (Sold after 20 years)