You can check it yourself. The best to check it is with an exhaust analyzer sniffing for hydrocarbons in the coolant at the radiator.
It can be pumping hot combustion gasses into the cooling system, superheating the coolant and causing air pockets. I'm not saying it is. That's just one possibility that can't be overlooked. Overheating can be difficult to diagnose and you need a tech that knows what he is doing. This is a very common issue in South Florida where I am.
Tuesday, September 10th, 2013 AT 12:17 PM