i would say you just had a faulty t-stat, no big deal except for the $$$ spent. call the company who made it and let them know their p[roduct was faulty. you might get a replcement adn or refund out of it. but i would say your motor is fine...unles syou let it overheat, but even then, it would have to way overheat to do much besides blow your headgasket(2 if you have a v6).
Regards, Cole.
Relegating to troll status sometime this week.
New Whip: 1990 Lexus ES250.
Old Hotness: 1995 GL MTX Zetec *IN TRIAGE*
"I had a little friend once, but it dont move no more...

"