The A/C would not cycle on.
After taking it to a shop they replaced a variety of pressure switches and other components, only to have the system fail two days later. I took it to a different mechanic and they quickly diagnosed the issue as a faulty temperature sensor - a relatively inexpensive fix.
Bought car. AC was cold but within 2 days started getting hot
I used the self diagnostic feature for the A/C system's lack of producing cold air. It read to have a slight overage of BAR pressure (2.7 witch is 0.3 over the specified limit), yet the compressor clutch remained engaged the entire time during my 2 minute visual observation . The lines felt as if the difference between the hot and cold side (supply and return lines) wasn't far enough away from each other to produce a noticeable difference inside the cabin (temperature wise).
I pushed the low side valve open to release some of the pressure down so that the BAR was within factory specs and now the compressor clutch no longer engages. I am going to change out the cabin air filter next but now see from the known issues submitted leads me to believe the evap. sensor is to blame.
I have a 2005 Mercedes C230 Kompressor Sport 4 door sedan. My AC was not working so I changed my compressor and flushed out the ac system and recharged it. The ac would blow cold for 2 to 3 minutes then start blowing hot air. My temp setting dial was set to the coldest when this happened. My mechanic was stumped. After reseraching on the internet, I concluded it was the AC Rerigerant Evaporator Temperature Sensor (part number 220 830 0772) which I got from my local Mercedes "Stealership". My mechanic is working on putting in the sensor now. I live in Southern California so summers are hot and dry. I need my AC to blow cold. I will keep you all updated.
My air conditioner does not turn on at all.