I replaced the thermostat last fall before winter set in..
I tried leaving the cap off while running the engine to circulate the coolant and get the air from the system, this seemed to work but now I have an issue with the coolant boiling out of the overflow tank if I bring the coolant up to the middle of the tank. Looking closely at the cap it looks like it has a crack almost 75% around it ..hoping it's the cap and not the head gasket from overheating it.