Reason I ask (maybe I should have mentioned this first) is if the climate control has disabled the clutch due to low pressure, it turns on that EC light and won't let you switch it off. Sort of like the EC button does anyways, and maybe that's the exact thought process MB had for this, EC means no compresor. If your EC light is on and won't let you switch it off, that's right, no compressor. SO, check that out. If the EC light is off, the system hasn't shut the compressor off, something else has, like the clutch itself is bad??? If the pressure switch is bad or just getting a low reading (sudden loss of freon?) then the EC light will be lit all the time.
Gilly

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