2007 SL550, 1996 E300 Diesel, 1959 220SE, 1965 Unimog 404.115-Sold
I have a 1996 E300 Diesel that at the beginning of last summer I replaced the A/C compressor, Condenser, Receiver/Dryer, and Expansion Valve and had the system evacuated and charged and the A/C worked fine all summer. This summer it was also working fine until about a month ago when it started to not be as cold as it should and I still had a can of R134 left over from last year so I installed the can and it was good again for a week or so and then went warm. After looking at all the connections in the system I noticed oil build up on top of the receiver dryer so I replaced the o-rings on the pressure switch and on the line going to the evap and charged it up after installing some leak detector dye. The system lost the charge right away and using a black light I could not find any sign of a leak. I ran the diagnostic and it had a code of b1232 pressure switch so I purchased a new switch from the dealer and tried to charge the system but it would only take about a half can of freon and the compressor came on but the air was hot. After checking for leaks again and not finding any I took it to the local garage and had the evacuate it but they said it would not evacuate down very much due to a leak. I cannot find any leaks and I still have the b1232 error code. I'm hoping somebody else has dealt with this issue and might have some direction for me to look at?