1996 Chevrolet C/K 3500 "05 duramax heat" Questions

...05 GMC 3500 Duramax with the same problem. Heated driver seat comes on by itself. It just started this week so I haven't been to dealer yet. My brother has an 05 Chev 3500 8.1 with the same problem, ...

05 duramax diesel coolant presure problem,no heat and blowing out of bottle You have a head gasket blown. Pushing combustion gasses into coolant and displacing coolant for no heat. You can remove ...