Overheated – Where Do I Start?

[daveccpa]

I just replaced my expansion tank. Car acted in a similar manner to yours. Sometimes it would leak, sometimes not. The last time there was steam in the trunk area from the leaking tank.

Pull the carpet in the trunk and see if anything is wet. If it is then the tanks cracked. Replacing it is a DIY project but isn't real fun. My bruises are just healed after two weeks doing that fun little thing. But it works fine now.