W211 E320 A/C problems. Live data photos of working and non-working - PeachParts Mercedes-Benz Forum

ROLLGUY · #1 10-10-2022, 12:20 PM

I have two W211 E320's to compare- one with perfect working A/C, the other not so much. The one with the problem has had the heater valve replaced (factory part), but that did not fix the problem. With the A/C on the coldest setting, I get some "cool" air from the right dash vent, and warm air from the left. I scanned both cars with my Icarsoft MB II in live data, and got some comparisons. From the car that works I got -99 on both in-car temp sensors (N70b1 & B10/4). On the car that does not work, I got 38.50 for the N70b1, and 35.07 for B10/4. (See photos 1 & 2).
The other screen with the compressor torque and consumption differs as well. The car that works was 15 & 350, the non working 18 & 690 (see photos 3 & 4). The remaining screen shows the refrigerant temp and pressure. The working car: 36.80 & 11.50, the non: 31.80 & 7.10 (see photo 5), photo 6 on the next post.

From looking at the data, I can assume there is something wrong with one or both of the in-car temp sensors? Admittedly, I don't know much about these systems. I do know that the refrigerant has a good charge, and I assume the compressor is working.