when running my front AC, which is pretty much all the time in fla, I get a high pitched squeal from the rear AC unit. It starts sitting at a light in the heat of the day. not so much when it is cooler. when I take off it stops squealing. took it to a shop, they said it was low on Freon and recharged it. now it squeals pretty much all the time intermittently but the pitch is higher. could this be the expansion valve? the mechanic next to my shop who is really good at building engines etc wants to start swapping parts. it is my daily driver for business. I am having trouble leaving it at as AC shop all day. if any one has a guy in Orlando please advise. thank you! lloyd
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