Running into a strange issue with the havc controls on my caravan.
I have the 3 zone control, driver, pass, rear.
When i set my temp to 22 degrees or lower i get cold air, (ac off), 23 and above i get very hot air, no middle temp.
Any suggestions on where to start looking?
thanks

 

A better description after some testing.
The system only blows heat in the front when the digital temp is set to 24 or higher.
Could this be a blend door or a temp sensor issue?