One problem related to engine cooling system has been reported for the 2006 Dodge Ram 2500. The most recently reported issues are listed below.
Outsider air door/flap in the a/c system on my 2006 Dodge ram pickup is broken which prevents air flow to the cabin. I removed the broken door flap, but now am unable to shut off outside air flow. This is dangerous to my family's health since I am unable to prevent outside exhaust fumes from entering the inside of the truck. Apparently this is common on all Dodge ram trucks in this make/model. Replacing the flap requires removing the entire dash and is very costly to have done by the dealer. Likewise, people have had it replaced multiple times and it continues to break. The design is very poor - made of plastic and the hinge can easily break. It needs to be redesigned and recalled by the dealer.