I really need help!! I have a 2002 Duramax building pressure in the reservoir and smoking white smoke out the tail pipe. We have took it to a diesel shop he replaced head gasket's and the injector cups. So that did not work. It is still building pressure and smoking. Not over heating at all. coolant is cold when it was sprayed out of the reservoir. We also put a new cap on. Any Help please. We have had our truck in the shop for a mth now and cant seem to get in fixed. a lot of money to.
