Date registered: Feb 2011
Vehicle: 2000 C230 Kompressor Special Edition
Location: Knoxville, TN
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Many C230's were not equipped with the digital climate control, so diagnosis is not possible through the console.
Since your drier has a sight glass, we know you have had some work done. I think that's normal on a 15 year old car. Do you have any records? When was the last service work done? What brand of compressor do you have?
You could have an overfilled/ underfilled system.
Or the cabin temperature sensor or the evaporator temperature sensor has gone bad. Without the digital system you can't possibly test to find out. An independent shop can read the codes, but that will cost money. Or you can buy the evaporator temp sensor yourself and install it, see if that fixes it.
Mercedes-Benz - Engineered like no other car in the world.