I have a 98 Transport with the 3.4. It started overheating about a week ago. It slowly lost coolant since I got it about 5 months ago. I changed the water pump and it seemed better but then it overheated again and now theres the milky residue when you remove the oil cap. Its not on dip stick. I just wanted to be sure. That does mean its the head gasket right? And how do I determine which one if it is?
Chris