A/C Issue on 1997 C230
 

I have an issue with my a/c. It started blowing hot air last week out of the blue even with the temp control set in the mid 50's on the dash. The next day it worked just fine and then went out the following day and has been out since. Had local mechanic check it on Saturday and he said all pressure readings and freon levels within specs. I am in FL and need to get this fixed before it gets hot. Some people have suggested replacing the a/c heater control valve instead of the interior control panel, please advise if this is something I can get to or should have a professional take a look at.

Thanks

There is a temp sensor of some kind. Mine went out and I BELIEVE this is what they replaced under warranty for that issue, but not 100%. Check into it.

Evaporator Temperature Sensor
 

Sounds like the temperature sensor attached to the evaporator failed. It's not hard to get to and should cost less than $100 to replace at dealer. Mine has been replaced twice.

Excellent, I think I have located the part and will replace it this week. Thanks for your help.

I have a simillar problem
 

my side vents blow hot and middle blows cold?? (1996 c220) should I have the same sensor changed?

That's not the same problem. It's probably the water valve (monovalve or duovalve).