Air Conditioning Not Cold on Mercedes-Benz ML500

AC system leaks and/or a faulty evaporator temperature sensor can cause poor AC cooling. The failed sensor can prevent the AC compressor from coming on. Leaks cause a low refrigerant level, which reduces the ability to cool.

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Average mileage: 116,779 (50,000–193,000)
5 model years affected: 2002, 2003, 2004, 2005, more2006
15 people reported this problem
6 people shared problem details
the AC blows out warm air..sometimes works though...when it 1st started happening, it seemed like if I rolled the window down the AC would start working..
When i am turning on AC in my car radiator fan is working on high speed, and i have no cold air. I changed auxiliary water pump & i still have the same problem.I have full freon in system. Thank you.
Ac was working fine while driveing all in a sudden hot air was blowing out then after several ignition turn on and off the ax starts working good again then goes back to the same problem cycle over and over note this problem was not repaired.
When Idling the A/C slowly begins to produce warm air. When accelerating and driving in traffic or on the highway the A/C works very well.
Compressor turning but no cooling. Freon level is low but not at a point to stop compressor.
ac was blowing and all of a sudden it just stopped.
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