Hi, it seem's like I have similar problem in my W164, but with some differences. On mine, air conditioning work proper on lowest set of temperature only. When I'm trying to increase the temperature a bit, the evaporator temperature is going down into -2 degrees and then AC is going to turned into a heater. Evaporator temperature is going up to the outside temperature and there is no more cold air flow. I tkinh that my solenoid valve is stucked open and not control the "power" of AC compressor. Do you know if there is a need to suck the gas from the system before I dismantle this solenoid valve? Thank you in advance for help

I have 2 sets of ac gauges and the high side quick couplers don't fit the high side port of my 2010 ML350. Can you please tell me why and where can I get a coupler that fits? Thank you so much.

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