I had this happen on my 400E. I don't know if this will hurt the compressor or clutch (it didn't seem to hurt mine), but I emptied a can of contact cleaner in between the clutch and pulley, cleaned and reseated both electrical plugs to the compressor, and lightly tapped the front of the clutch plate a few times with a ratchet. I think the engine was actually running and I was calling for cold air on the a/c when I tapped the clutch plate. This was at the recommendation of the dealer's shop foreman. He said that sometimes the clutch sticks and this will unstick it. I don't really know which one solved the problem, but it started working after that. I'm glad it did, because the foreman told me that trying to repair the a/c clutch on the 400E without taking the compressor of the car is not a fun job.
Here is a good link on clutch problems with an idea from Deanyel that I would consider.
http://www.peachparts.com/shopforum/showthread.php?t=218902&highlight=400e+compressor+clutch
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Not sure, but it's possible that the clutch slippage fault requires getting both signals and finding a disparity between the two, as opposed to just not getting one of the signals and being unable to do the comparison. Not specifically familiar with your car but shouldn't be hard to replace the speed signal sensor, normally doesn't require removal of the compressor, but the first step would be to have a look at it, to see if the connections look good and wires not bare etc. One of things that I've done, and I'm sure this in primitive and unelegant, is to run a 12v wire off the fuse box (proper amps) to the compressor power line to see if the clutch engages, stays engaged and cools. If so you know you don't have a compressor problem, clutch engagement problem, clutch gap/shim problem etc. This confirms that you have an electrical problem - that the signal is simply not getting through the morass of tests in the system.
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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles
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