Oct 10, 2015
Based on the combination of symptoms, I'd start by having a chemical test performed to check for a leaking cylinder head gasket. That involves drawing air from the radiator, while the engine is running, through a glass cylinder with two chambers partially-filled with a special dark blue liquid. If combustion gases are sneaking into the cooling system, the liquid will turn bright yellow.
Those combustion gases can pool under the thermostat and cause it to not open. Thermostats have to be hit with hot liquid to open. Hot air won't do it. If that test is negative, any other cause of overheating is going to much less serious.
Tuesday, October 13th, 2015 AT 11:00 AM