I know this is an old thread, but Im new and ran across this same problem and found the solution. The issue in my 2015 is that if you have the defroster on no mater what the temp is set at it blows hot air out of all the vents to include side vents to some extent even with the fan on low. We found it by accident. Switched it off of defrost and the car cooled off inside like it should.
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