Engine/Transmission (1998.5 - 2002) Need T-stat P/N please

[JCyrbok]

Today I noticed that my truck was running alittle warmer then usual. I was running the highway at about 70mph and temp was just over 200, empty. Usually it would hit 190 and then fall back down to what I would quess to be 180. Fan was also running too. Ambient air was about 80. Like I said this is abnormal for my truck. Recently I have noticed that T-stat appears to stay shut longer than usually before temp falls back after initial warm up.



A/c was off the entire time. Last flush and fill was about 15k ago, coolant still looks good (I know thats not scientific,lol)



Some of the things that I checked to rule them out were:

1) Radiator fins which were clean.

2) Coolant level while hot was near the full mark for hot. I topped it off.

3) Engine Oil. Within the upper/lower limits.

4) Fan. Like I said it was running when I stopped.

5) Trans oil was also with in the upper/lower limits.



Only other thing that I an think of is the T-stat, not functioning properly.



My Cummins part book lists two numbers but does not list which is 190 and which is 180. I want to replace with a stock 190 T-stat as I have never had a problem in the past with overheating.



Can someone post the P/N for the t-stat and any gaskets that are needed.



ALso has anyone used one of the "fail safe" T-stats, that fail open if they crap out on you?



Any other ideas of what the increase in temp could be? See below for truck info.



Thanks in advance,



J-

 

[Bob Wagner]

the 180F stat number maybe be different now, but I have 3954194

 

[JCyrbok]

Thanks Bob,



How much coolant should I expect to lose when changing the t-stat? or how much should I drain to keep from losing it?



ALso what is the real torque spec for the bolts on the water outlet? My DC service manual says 18lb/ft others here say that is too high and will snap the bolts off, which I really dont feel like doing, LMAO. ANyone know.



Thanks



J-

 

[JCyrbok]

BUMP TTT



ref the amount of coolant to drain or lost while changing the T-stat and the correct torque spec on the bolts for the water outlet.



Thanks a bunch,



J-

 

[Bob Wagner]

18 ft lbs for the t stat

 

[JCyrbok]

Thanks again bob, thats what I thought, but thought that I had read here that it was the wrong spec and that some one had snapped off their bolt heads with that.



Thanks again,



J-

 

[BarryG]

J:

When I changed my t-stat I lost a little coolant but not too much). I may not be the one you were referring to but I also snapped off a bolt for it. Could be my wrench sucks or my math conversion skills suck (I used an inch lb wrench). In any case they are not very strong just be careful.

 

[JCyrbok]

Thanks for the info Barry (it was someone else, LOL).



J-