I was driving the truck to work this morning on the highway and i looked down and my engine was running at 220 degrees. So I pulled over for a sec and it droped to 190 and stayed there the rest of the way to work. When I got off it did the same thing on the way back to the house. Could it be the thermostat? If so how much are they and where they located. I would apreciate any help.

Scott

 

Dealers price is about $57.00
Napa about $28.00 If you are asking where is the Thermostat located at
it is located at the end of your top radiator hose on block.

 

some guys say the puke bottle will get oil on the rad when driving,most say just putting a hose beyween the rad and intercooler doesnt cut it,you need to remove the rad and presure wash it,most were very surprised that thhier rads cooled at all they were so plugged. jsust a thought

 

That's definitly a true statement. Check my gallery and see my radiator pics.
I also put in a Cummins 180*F t-stat. Just from reading other posts here, I'd stay away from the non-Cummins t-stats.
The Cummins P/N I used was 3967195, and I think it was somewhere around $25-$30.
Read this thread too:
https://www.dieseltruckresource.com/...ad.php?t=70392

 

I put the cummins 180* t-stat in mine and paid right at $50 from the local cummins shop. Gotta love shipping and handling and special order charges.