Mercedes-Benz
S430
20

Poor AC performance Due to Evaporator Temperature Sensor Failure on Mercedes-Benz S430

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.

Problem Data
RepairPal Verified
Average mileage: 131,348 (50,000–206,000)
7 model years affected: 2000, 2001, 2002, 2003, more2004, 2005, 2006
20 people reported this problem
Comments
Viewing 1 - 7 of 7 comments
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 fan blows but not cold. the computer has an error ec message
i was driving and all of a sudden my ac stop blowing and my car shut off. finally got it to stop turned key off took it out then restarted it. my ac clutch won ingage now but blows from the vents very strong. could you give me a hint to what it may or may not be. Signed Cali BOY
Fixed my AC for $3000 a year ago. Now I have similar problem again.
The fan blows perfectly but not blowing cold air. Freon is full, All fuses and relays are ok. I am thinking of putting a direct switch to the compressor since passing direct voltage to it works
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.