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Message: <blockquote data-quote="tyromeo55" data-source="post: 1862550" data-attributes="member: 1719"><p>So.....  Ho much did you add?  Under the hood there should be a sticker that gives a ref charge qty.  Ill guess that it is a high 2# to low 3# number.  If it didnt need any and you added a 12 oz can then it is overcharged by around 25%.   That would be no bueno  (Not that I practice what I preach all the time) The only way to really charge an automotive A/c is to make sure the supporting side of the system is all working properly and then evacuate the system and re charge with appropriate oil and virgin REF to the MFG spec.   The second best way is to charge by superheat using a PT chart ( assuming it has a fixed orifice )</p></blockquote><p></p>