Engine Cooling problem
1996 Toyota Camry 6 cyl Front Wheel Drive Automatic
Rad cracked and engine got hot. Replaced rad, overheat again so replaced thermostat. Problem still persists. No obvious leaks to system. Temp is fine, then spikes quickly. Heater works intermitently and coolant gets blown out of the overflow tank. Hoping it's not the head gasket, and would like to know what else to test prior to going down the head gasket replacement route.