Thanks for the quick reply. I should have been clearer in my prior post. I only see the front of the clutch turning slightly when I have the a/c selected to on, inside the car. The front of the clutch pulley doesn't turn at all in the "0" position of the a/c selector panel.

I am getting a DTC 6 on socket 8, which is an a/c belt slipping, but when the underhood temps are really hot here in Arizona, I sometimes get a lockout on startup anyway and have to restart the engine to clear it (at least for the past few years). So this code has been a regular event for me in the summer. Maybe this is a sign of a wearing clutch.

Is the clutch something that is either an on/off device or does it weaken with age? I will pull the connector tomorrow and check the voltage.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles