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sounds like you need a set of gauges to check hi-side pressure - i almost replaced the hi-side cut-out switch on mine thinking it was bad cuz it was kicking out the compressor on really hot days - turns out i had too much freon - check this vid out - he is right on target http://www.youtube.com/watch?v=PqNR7...e=channel_page
David rock the best mechanic out there that takes what he has and makes it work he has helped me out with a couple of things and has been spot on.