My dads JK has a heating problem. The drivers side vents blow out cold-cool air but the passenger side vents blows out hot air. Has anyone else had this problem?

 

I can't believe somebody hasn't answered you yet. Personally, I've not had a problem with the heater, but I've seen many threads about those who have. It seems that the heater box has a movable blend door that can warp and stick...thereby keeping the air from going where you want it to.

Do a search for the heater problem....I've seen some good answers. I think what you're gonna end up having to do is get the heater box replaced. Good luck

 

I have the same issue, mostly likely need to visit the dealer for a fix.

My post about this exact same problem
https://www.jk-forum.com/forums/show...light=cool+air

 

Bummer - I thought this was the emergence of an undocumented dual zone climate control system.