I saw several other threads on this, but no one seems to come back and give the solution, so I don't know what to actually look for. I have a 2005 Yukon Xl that will be blasting cold air and then suddenly will instead start blowing hot air from the front vents (both sides). The rear AC is always ice cold. Only had the car a month so no idea on refrigerant levels or anything, but AC has been working great sans this happening twice. I've occasionally heard something "clicking" down near the passenger feet area, sometimes at random times. It hasn't seemed to affect the AC, but maybe that is still related? Just looking for tips and easy things to try first before I spend considerable time and/or money. Thanks.
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