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Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 53904
Experience:  Bosch Certified Master Tech. Over 35 years experience.
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My ac compressor is working but blowing hot air out the

Customer Question

My ac compressor is working but blowing hot air out the vents
Submitted: 1 year ago.
Category: Mercedes
Expert:  Marty replied 1 year ago.

Hi Richard, my name is***** do you know the compressor is working? Have you had pressure gauges on the high and low side fittings?

Customer: replied 1 year ago.
The clutch is engaged and turning. Hot air is coming out the vents. I tried to reset the climate control but the lights on the defrost and receive button never stop blinking
Expert:  Marty replied 1 year ago.

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.

Customer: replied 1 year ago.
Do the compressor suppose to run all the time
Expert:  Marty replied 1 year ago.

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.

Expert:  Marty replied 1 year ago.

Hi Richard, I'm just following up with you on this question. You never rated my service therefore I never got paid for answering your question. If my answer was helpful I would appreciate it if you would rate my service so I can receive credit from the website.