Originally Posted by
Civic2Scooby
seriously? Thermostats are like 7 dollars.......
I would also have your radiator cap tested. If it is failing, it will allow pressure to escape under high heat ie with the A/C on and allow the coolant to become de-pressurized and overheat.
hmm... that's a good point. a rad cap can't be all that expensive and chaging it certianly cant hurt.