I have read several posts here and and they were all for 98 320's. I am sure they are ot much different but just wondering if someone has some wiring diagrams or any ideas to troubleshoot, thanks. I am going to manually apply power to the clutch today and see what happens

Here's some info for troubeshooting:

http://www.whnet.com/4x4/climate.html

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W163.154, M112.942, 722.662, ZF.970.402

Well I checked all connections and found that I am getting power all the way to the compressor. Looks like it is the clutch itself. I wonder if this is a replaceable part or if I have to change the whole compressor?

it appears to be available seperate, and is mercedes number 000-230-35-28
if you decide to buy it, send me your chassis number to confirm the part applies to your model i did a parts search using 163.172