it means that this is a control circuit problem.there is a slight poss that the compressor clutch is drawing too much power and has blown the mas relay.you need to find an amp meter and see how many amps being drawn by clutch[should be btwn 5-7] if that is good then we have the speed sensor on the compressor[gk+ and gk-] you can identify these pin sockets [where mas plugs in] and measure with acvoltmeter.notice ac not dc.and then there is the temp sensor in the water jacket that is supposed to cut the comp off during an o/heat and this could have gone bad.not sure of pin designation but will have letter t in it.if measured at mas socket and is a ground then this is problem should be open circuit.try these and see what's going on.

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David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
http://www.w108.org/gallery/albums/A...1159.thumb.jpg

david is right on, the service cd has a good compressor cut off troubleshooting section, (I am following it for my 1993 w124).

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1993 Mercedes Benz 300D 2.5 205K (ex wife's)
1984 Mercedes Benz 300SD 320K (SOLD)
2004 Mercedes Benz C240 75K
1995 GMC Sierra 2WD 5.7L 188K
1983 Mercedes Benz 300SD 239K (SOLD)
1987 BMW 325i 220K (SOLD FOR SALVAGE)

609 Certification