So,i had my heatercore replaced months ago. I never did check to see if all my vents worked afterwards as i never thought of it since its hot outside. Its was raining and chilly the other night and my windshield was fogging up. Turned on my heat and set it to defrost vents and nothing,nadda was blowing out my top vents. everything else was blowing though.,..Im sure this is a door problem or something,but what or where do i need to look at first? Im wondering if the shop that did the core disconnected something. Cant really blame them though as its been a while and its just a he said,she said thing.

 

There are ALOT of threads on this SEARCH it. as a matter of fact theres a thread thats not even two weeks old about a similiar problem you will find a good answer

 

http://heatertreater.net/Dodge%20Product%20Page.htm