Seems to be going around.

https://board.moparts.org/ubbthreads/show...e=0#Post8028537

Probably a blend door busted.

This is supposed to be the cure without having to pull the dash out of the truck.

http://www.heatertreater.net/magento/index.php/dodge/ram/02-08/dodge-ram-02-08.html

Kevin