Engine/Transmission (1998.5 - 2002) If she is heating up - don't assume its not the

[hammersley]

Thermostat..... my truck all of a sudden was running in the 215-220 range when it clearly shouldn't have been..... and I have all new up to date stuff... ... like new radiator-hoses-water pump - thermal viscous fan drive/fan blade assembly... . I thought that if a thermostat had went bad --- (and this one only had 20,000 miles on and was only a year old) it would either stay open or shut... . Well check out the picture - notice the black like material that looks like a foam insulation you would spray around a window. It wasn't like this when I installed... . nor do the new ones have it. Changing to the new cummings thermostat (and this one was a factory one as well) solved the problem immediately! So - don't assume its not the stat - even if you think it shouldn't be... .

 

[MChrist]

It it excess rubber, maybe?

 

[BIGNASTY]

Make sure you install a thermostat that when it fails it fail open at least you wont burn up you motor

 

[PBJ2500CTD]

It it excess rubber, maybe?

Looks like it puked its core/wax.

 

[wlowe]

I justed replaced my thermostat also. The old one was running warmer than normal and looked like yours with pieces of rubber coming loose in it. I replaced it with a dodge number 05015708ac but the thermostat had a cummins number stamped on it, 3946849. I believe these are 190 degree thermostats. The new thermostat doesn't have the rubber seal in it to break up.

 

[BGlidewell]

Thanks for the PIC and the heads up!
I replace thermostats regardless every time I change belts and hoses.

 

[ChrisOlson]

Thanks for the PIC and the heads up!

I replace thermostats regardless every time I change belts and hoses.

great idea there



chris

 

[Bob4x4]

That is very common on the 24 valves,Between that and the oil/dirt covered radiator you can solve over 90% of overheating 24v's