Not sure what is going on with the AC in my 350. This week there was a smell when I would start the car that would leave, but noticed that the AC was not cooling as well. Today when I started the car I noticed that the AC button light was not on and when I pushed the button it would not turn on. The AC has been an issue with this car since purchasing. Could it be a fuse? Any help would be appreciated.

Thanks!

 

Please scan for codes, report back. A poor misdiagnosed AC system can be costly. Hopefully, you got a code.

 

When you say scan for codes, where would this be done at??

 

1 - Find/Borrow/buy a decent OBD2 MB-aware scanner
2 - Cconnect said scanner to the OBD2 port
3 - Once the scanner has identified the vehicle and listed the modules, enter the AAC (air conditioning control module)
4 - Look for error codes, read actual data (refrigerant pressure, different reported temperatures, etc)
5 - If the scanner is bi-directional you can force the compressor to work (if still able to do do) by actuating the Electronic Control Valve (ECV)
6 - Actuate the clutch magnet, and listen for the click on the front of the compressor, or see the pressure plate move.

Also, check fuse 12 in the FrontSAM. See link https://fuse-box.info/mercedes-benz/...uses-and-relay