Two problems related to defogger have been reported for the 2006 Dodge Ram 3500. The most recently reported issues are listed below.
The recirculating door breaks without warning and occludes the airflow to the defroster. This is happening on Dodge trucks and has been happening for quite awhile. Mine is a 2006 3500 when the door breaks pieces of it get into the blower and causes a major vibration when turned on high, since your defroster does not work it is a driving hazard Dodge should be made to fix this issue free of charge instead of charging people $500. 00 + to fix a known defect.
: the contact stated the heating defrost door has become stuck, disallowing the ability to heat, defrost or cool the vehicle. The service dealer confirmed that this has been occurring in about one in every ten vehicles due to a vacuum operated system.