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i have a 1996 mitsubishi 3000 gt with some ac issues…. while driving around air is nice and cool but i feel can be colder…when idling it warms up a little like at a stop light…..on an 85 degree day low side pressure is 40 psi and high side is 160 psi…..what yu guys think? low on refrigerant? i must add that compressor runs constantly
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What RPM did you have the car when you got the readings?
RPMs should be between 1000-1500 (depending on your manufacturer) so check the manual to ensure you have it set correctly when you read the guages.
High pressure should be around 2.2 to 2.5 x of the ambient temperature.
Low pressure should be 60-85 PSI (depending on what your manufacturer says)
-Karl
It is normal for the ac to warm some at a stop. here is
a chart to help you. according to this chart you seem low.
Try adding 4-6oz see if things improve.http://www.idqusa.com/faqs.php?faq=74&faq_id=74&category_id=18
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