would be placing a tstat in boiling water the proper way to see if it opens or not? back story is i pulled the motor out of my 95 to do new gaskets and seals, also replaced the entire cooling system( radiator tstat water pump hoses rad cap) it will warm up and creep to 260 and stay there even with both fans going it will still go to 260, the upper hose never gets hot, so im guessing faulty tstat id just like to test this one to make sure if theres any way, thanks