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Hey Bud, I'm pretty sure when you have it on defrost the AC compressor runs to condense moisture inside the cabin and defog the window during rainy days. I think it's supposed to know when it is below 35-40°F (2-5°C..eh) and not run the AC, but I've always been suspect of that. So, be sure you're not running defrost unless you gotta. And don't recirc the air either, this will cause your windows to fog up, recirc only on crazy hot days or when you're going by a pig farm er sumthin. I see people drive by all the time all fogged up and would bet real money they're recircing the air.
I could be wrong about the AC shutting off at what temp or if it even does. But I'm certain the AC comes on when at 50°F & above when you have it on defrost.
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