1997 GMC Yukon Q&A
1997 GMC Yukon Question: What will be causing white smoke from tail pipe,and no coolant in radiator.
You need to stop driving this truck or you will be replacing the engine. You have a leak in the cooling system. You need to find a repair shop to check for a leak. By now you need to have it checked for a blown headgasket. - PARTS GUY
Agree with Parts Guy! Stop driving the truck, having the cooling system pressure tested for leaks, it may be allowing coolant into a cylinder due to a failed head gasket. There is a simple chemical test to look for the presence of carbon monoxide in the cooling system (which would only be present if the h/gasket was blown), the test is called a Block Test. - patrick mannion