I have an E320, 2003 model with 60,000 miles. I just bought it used and this was a noticeable problem. I have no idea how long its been like this. It has a weird A/C problem and I need some help. The Drivers side A/C blows warmer air than the passenger. The A/C compressor is functioning, but the drivers side air blows warmer. I took it to the dealer and here is what they did to troubleshoot (all of this directly from the workorder):

1. Performed short test, no codes related to the problem.
2. Inspected fuses for AC push button unit, all good.
3. Inspected push button unit power supply, all good.
4. Installed known good push button unit, no change.
5. Performed evac of AC System, .25lb low. Charged system with AC Dye. Performed power supply check with meter at compressor wire, all good.
6. While monitoring values of AC compressor, tech noted there was low pressure on the low side 9-15 and very low pressure on the high side 125-150. Need to replace AC Compressor and perform re-check of the system. This is the first step in diagnosing problem...

Again, the air is very cold on all the outlets in the car except the two drivers vents and the RR passenger vent. It's like the left side of the car is warmer and the right is operating normal. To me it seems the compressor either works or not. Why would the compressor cause this problem? Of course the dealer wants $1400 to replace it...

Any help would be greatly appreciated.