Help Overheating

[smokin95psd]

I have a 1995 PSD F-350. I was on the interstate on my way to myrtle beach. I have had the truck almost 3 years everyday driver. NEVER EVER even attempted to run hot. stays on the O in NORMAL ALLLLLL the time. summer or winter. it is a 5 speed. i was crusin along 70 mph and i saw my temp gauge start to creep up to the R in normal my analog gauge said about 215* I thaught nothing of it i had the a/c wide open and it was about 94* F outside. i turned the a/c off and it continues to rise past the L in NORMAL and i immidiatly pull off and let it idle. it cools down to the A in NORMAL about 235*. i open the hood and water is boiling in my fill tank. i crack it to let it vent and it pushes alot of the water out. it continues to overheat i cut it off and wait for the tow back home. i get it home and install a new t-stat. it is still overheating i put both of the t- stats in a boiling pot on the stove and neither open up. they are suppose to be 205 t stats. the old and new t stat neither open up. also the truck doesnt leak coolant anywhere. help me please!!!

[mschn99]

if neither t stat is openin up in boiling water, i would venture to say the second one is bad out of the box......might even want to test the next one.....ive never had a factory t stat bad out of hte box, but i have have seen and heard of several aftermarket ones not opening out of the box......i beleave your right...they are like 200-210 degree t stats i beleave.....

[gbear]

it sure looks like you got a bad thermostat. If there 205 degree stats they should have opened in boiling water (212 degree) If I put in another I would test it before installation. Did you leave it in the water long enough would be my only question?

[mschn99]

another trick, put some salt in the water, raises the boiling temp......

[smokin95psd]

hey i think we are all on the same page. i left both t stats in 250* F water for about 5 minutes at least. i would say advance auto parts and auto zone are crap!!!! I guess i will wait a week for my Motorcraft part to come in. thanks alot guys. i love this website. thanks alot

[mschn99]

Originally Posted by smokin95psd

hey i think we are all on the same page. i left both t stats in 250* F water for about 5 minutes at least. i would say advance auto parts and auto zone are crap!!!! I guess i will wait a week for my Motorcraft part to come in. thanks alot guys. i love this website. thanks alot

anytime man, sorry to hear about the problem...but i will GARANTEE at 250 degrees that t stat should have opened fully after five mins.....sounds like at least it will be an easy enough fix to figure out.....

[gbear]

I had this happen on a gas engine on mine (autozone junk) That why I get OEM parts when ever possible. With today fuel prices trips to town get costly.

[smokin95psd]

a motorcraft t stat solved my problem thanks alot guys this website is out of this world

[mschn99]

Great to hear all is OK now.....Sometimes spending the few extra bucks on a facatory part pays off....

[gbear]

That great man, like I said before I have had some bad experiences with non OEM parts. And I like saving as money as much as the next guy. But I also hate doing the same project over even more. I'm glad your problem is solved.

Jim