7/22/2012
I have a 1978 MB 300cd, diesel. I have type II climate control system. Several years ago it was converted to R134a by a professional MB shop. It was cooling ok for about 8 years. 2years ago then compressor went out. This week I installed a rebuilt York compressor, receiver/dry and expansion valve. I put in 4 4oz Ester oil in the compressor and 3oz oil in the dryer. The oil also had 1oz of Ice32. I pulled vacuum for 30 minutes. Vacuum held without for 1 hour without any leakage. The outside temperature is 88 degrees today. I put 12oz of R134a. The low side pressure shot up to 72 lbs and the high side was 145lbs. I raced the engine and the low side dropped back to 65lbs and high side went up to 180lbs, But no cold air. I shot another 12oz of 134a still no cold air. Vents were blowing but it was 85 degrees. I shot another 6oz of R134a and still no cold air. Total of 30oz of R134a. The low side was up to 75lbs and the high side was 150lbs.The aux fan was not running so I had a big blower fan from a home unit blowing on the condensor. The high side pipe coming out of the compressor was very hot to touch. Today, I have pulled vacuum again and researching what could be the causing the problem. Do you know anything that would assist in the troubleshooting of the system with the dreaded Servo. Thank you in advance for your help.