over heat water boiling is it head gasket?

[masterwilde]

a stuck thermostat.

Hope so, i know thermostats are nice and cheap and i may be able to do that myself depending on location due to my disability

[DanDombrowski]

Hmm, I wouldn't think that the water would boil in the expansion tank with a stuck thermostat - if that were the case, the boiling water could never get to the expansion tank. Am I wrong?

Only way to know for sure on the head gasket is a compression check. Checking the coolant for oil, the oil for coolant, and checking for coolant out the tailpipe are all good indications.