i have an 03 lt model and if you turn the temp on 90 deg the heat is scortching but if you move it one degree to 89 it blow cold, it blos the same temp from 68deg to 89deg but it blow hot at 90deg

what gives, is this a problem in the control unit? i have read alot of threads on dual zone control but nothing like this problem

thanks
travis

There is a reprogram for A/c control head concerns and if that doesnt fix it usually its a hvac actuator.