2009 focus sel when hotter than hell out no a/c BUT normal 75 degree day most likely will work fine...on days inop i ran 12v to clutch all worked ok.....all inside of dash works ok lights all light heat will turn on ok off ok if a/c been working it will come back on....BUT if hot out no a/c on. So must be a inside pressure switch somewhere?????
If it's not playing on the hotter days, it sounds like the high pressure switch is holdiong ou out. Has the system ever been opened or refrigerant added?
As far as I know, the AC system pretty much relies on old school trouble shooting.
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