Problem Description and Possible Solution
The evaporator temperature sensor can fail, causing the AC compressor not to cycle. If the AC compressor does not turn on, the AC system will not blow cold air. If the compressor is stuck on, the air will be very cold at first, before warming up.
Average mileage: 131,348 (50,000–206,000)
20 people reported this problem
air conditioning works only sometimes. Had unit fully charged. Air only worked sometimes. Brought to Mercedes dealer. Found faults in system. Dealer corrected them. Picked up car after Mercedes said it worked fine. Next day air did not work. What to do ?. Now there telling me it might need an air conditioning control modual. Now I have to drive another hour and 15 minutes to my Mercedes dealer in Hartford Ct. Not happy that this wasn't corrected the first time I brought the car in for repair. Thought Mercedes dealers were better than that.
The ac works well when it works. It may come on and then it may not until I travel over a bump in the road.
Sometimes it blows cool air on my feet, at the same time it blows warmer air on my face.
I have had freon put in the car in March 2015 and again April 2016. Since Aug 20,2016 it's been touch and go.
It seems as though it might try to cool down, and afterwards I'm at home.
I can drive with the windows up/ but sometimes before I get home, I'll have to open the windows for cooler air.
How much should this cost to have repaired? (ballpark estimate)
The air is the on position, but I can't really tell because it may or may come on.
Just had ac compreasor replaced due to the magnet inside the the ac clutch going bad. Now the system blows cold sometimes. Usually when i first take it out of the garage but when its hot out and car sits outside, its like it wont cut on. I believe this is the issue now of the (evap temp sensor). Still not entirelly sure. There are no check engine or faulty lights for this problem.