ML350 air conditioner blow cold/hot air

Question by Manuel Rivera posted 2 months 1 week ago in 2006-2011 (W164)

The A/C cools great and suddenly it seems the compressor stops working and it blows ambient temp air. It repeats a lot of times during the day (temp here during the day is over 90 degF) The coolant pressures were checked, I remember like 50-220 psi or something like that. A sensor? relay?