BenzWorld Junior Member
Date registered: Aug 2009
Vehicle: 2001 C320
Location: Frisco, Texas
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
I have a 2001 C320, My A/C works intermittently. For example, when the engine is running and going down freeway, usually works, blowing cold air, but if car sits in sun for a while, no ac at all just hot air. This morning when it was sitting in shade and cloudy day ( I am in Texas) the ac seemed to work fine once I started driving, but when I came to a stop, it went back to blowing warm air. Also, if I leave the car in the sun or drive it in the sun, it does not work. When using the AC Diagnostic, I saw that the value 12 (sun sensor) was sometimes ranging from 5-8 volts, isn't that a little high?
After some trouble shooting, I think it my evaporator temperature sensor is not working as well.
My readings for the evap temp sensor using the a/c diagnostic was 97 degrees, really high. Sometimes it will go lower, example when the ac starts working on highway, it will display around 47-50 but most of the time, it is in the 78-100 range. I did realize my ambient temp sensor on the front bumper is missing, hence why when I check the temperature on my dash, it sometimes shows 185?
Also, once car is in sun for too long, and trying to run ac, the battery/alternator warning light comes on, visit workshop display faulty warning, and sometimes the hi beams come on the dash and stay on, have you heard of this before?
I have attached a picture of the warning messages that appeared once I was driving the car in the hot sun for a while. You can see that the hi beam light was stuck on (middle of the day). Once I went home, shut car off and started up in the morning, everything was gone.
Any help or insight would be greatly appreciated, thanks so much.