Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
Hi Richard, my name is***** do you know the compressor is working? Have you had pressure gauges on the high and low side fittings?
Okay, just because the clutch is turning it doesn't mean that the compressor is actually pumping. You should get pressure gauges connected to the system to see if the compressor is working. You may have a bad compressor or not enough refrigerant in the system. Resetting the system won't help if the compressor is engaged. You should also block off the hot water supply to the heater core to rule out a defective heater valve.
Yes, this compressor does not use a clutch. It uses a valve in the compressor to control the refrigerant flow. You need to get the refrigerant level checked and the system pressures checked. You might just need a recharge.
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