I hope this does not offend anyone but between the center vents is a dial with red and blue on it. It need to be all the way to blue or it will warm the air coming out. I had an F15 loaner and was shocked at the AC. I am in Atlanta and it's hot. Eve though I have the same dial on my 535 I had never touched it.
I dialed it all the way to blue and it was day to night. I am baffled by the use of the dial because it seems redundant but check it.
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