over heating

I would start by verifying that the cooling fan is operating properly, then replace the thermostat. If the head gasket was bad enough to cause it to overheat I would think you would start to see some symptoms like you mentioned.

My truck did the same thing. I had the thermastat replaced and the fan clutch. If you have driven it while it was hot it could have blown your head gasket. Also you may need to have your radiator rodded (flushed). Hope this helps.