04 WJ limited with auto hvac. Noticed since the temp has gotten in the 40's when set to auto either it blasts heat or cold air. When I set it at say 75 it eventually gets too hot and never seems to stop blowing heat, I turned it down and at about 65 it finally switched over to cool air. It seems that when the outside temps were in the 50-60 it was working ok. Anybody experience this?