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Old 09-15-2007, 06:57 PM
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Join Date: Mar 2007
Posts: 29
Question 1990 300SEL a/c problem

If working on cars drove you crazy I'd been there a long time ago!! I purchased this car knowing the air and radio did not work. The compressor clutch was locked up. I have replaced the following in the a/c system. New dryer, txv, and reman compressor. Flushed the system. Charged the system today. I am using R134. Static pressure 100 lbs. Low pressure at idle 45 lbs. High pressure at idle 250 lbs. Air temp from center vents 78 degrees. I have heard that these a/c systems arn't great but I was hoping for a temp of 60 or below. Low pressure at 2000 rpm's 20 to 25 lbs. High pressure at 2000 rpm's 225 to 250 lbs. I know there is no water going through the heater core because I cut the rubber hose and plugged both ends. Is there an air flap that would cause the air to bypass the a/c core? I have had this car a year and would soon like to start driving it. Any help would be appreciated.
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