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I have a Mercedes E-350 (W212 M272.980) and having AC problem. When I am parked and start the car, the AC works only from the driver's side and the passenger side blows regular air. But when I start driving both sides give regular air when the AC is turned on. I had a mechanic inject dye to check any leaks and found NO leaks. Could you help on resolving this issue please? Wanted to get your opinion.
Thank you in advance!
After discussing with a friend, we considered two problems with that.
1st, Lacking the refrigerant;
2nd, One or more of the stepping motor failures.
For 1st, you might check the pressure of the AC; For 2nd, you might connect an MB Star to read the error code and test the stepping motor.