Here's a new twist on the 124 compressor kicking out upon slip detection:

I was told by a long time MB tech that these compressors sometimes kick out when they get older not due to clutch slip, but because as the compressor wears, internal thrust allows the shaft or wheel that is looked at by the rear rotation sensor to move away from the sensor which aggravates the problem.

The only known solution is to replace the compressor. It MIGHT be possible to modify the sensor so that it seats further into its hole.

Mine has been kicking out occasionally after restarting soon after shutting down. I have theorized that the load is heavy under these circumstances because the high side pressure has not had time to bleed off.

Friday evening, in 100 degree heat, after running on the freeway for about 15 or 20 minutes, the a/c stopped cooling and I thought that something catastrophic had occurred. After stopping the car and restarting the engine, it was okay again. I am now wondering if the worn compressor/sensor issue is my problem.

Have a great day,