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Old 05-03-2006, 10:01 PM
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Join Date: Sep 2004
Posts: 36
'88 300SEL air conditioning problem

car seems to be blowing about half cool. I put thermometer in center outlets and just barely get 65 degrees. I can feel some cool air as though it is introducing outside air along with the cooling . Could this be a monon valve problem and if so what is the solution? The system appears to have a full charge.Thanks for any input . Pauljc

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Old 05-03-2006, 10:27 PM
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Join Date: Sep 2004
Location: DFW / Collin County Texas
Posts: 1,882
Originally Posted by Paul J C
The system appears to have a full charge.
What leads you to believe the system has a full charge? Have you hooked up a manifold gauge and measured high and low side pressures? You cannot go by sight glass alone, especially if it is a converted R134a system.

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