Date registered: May 2010
Vehicle: 1995 C280 145K miles
Location: DC, USA
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Resetting the climate control AC computer
I have had my share of problems with my AC unit. Recently though I am unable to get it to blow cool air. Yesterday for a moment the AC was blowing cold air through the center vents and HOT air through the side vents. Today I can't get it to blow cool air through any vent even if I reduce the temp to the coldest setting "LO".
If I keep the AC temp at 72 and auto, the air through the center vent is warm but the side vents are warmer, outside temp is in the 60s and the cabin gets warmer and warmer. Last month the AC computer went erratic and my fan speed was jumping up and down automatically even if I kept it at 1, 2, 3 or 4, then my temp reading went from F to C and back to F!!!!
I always use the EC setting for winter. For summer I manually keep temp between 60-70. I never set it to auto and leave it all year round as some do. Today, neither auto or manual temp control seems to work.
There are no lights that stays on to indicate a problem as some have referred to (EC light), my compressor seems to come on more frequently these past couple of days. I know I may need some freon, duo-valve cleaning, evap, maybe new compressor, etc. This all is for the spring.
Till then, does anyone know how to reset my climate control system using the climate control buttons available on the front panel? I have read that you hold down a couple of buttons for 10 secs, then restart the car, then I have also read other stuff. I have read that there is a diagnosis mode but I have never been able to activate that following those instructions.
Anyone know of the reset sequence to my AC system? Would you know how to initiate the diagnosis routine as well?