I just ordered a new thermostat. Cummins said I needed #3946849 But this https://www.dieseltruckresource.com/...=faq&faqnr=112 has a different number listed for my 2001. It lists #3937171

Should I call Kenworth and change my order?

 

Order to your engine id #. There are 4 or 5 for the 01-01.5's

 

Mine was Cummins #3946849. It's a190F.

 

I called Cummins West, told him I had a 1999, and he shipped me #3967195. He muttered something about there being another part# but it was problematic so he was sending this one. It ended up being a lot cheaper than I expected so I'm worried I've got the wrong one. For the life of me I can't find my engine #. I had a front end accident where the radiator was replaced and I wonder if the repair shop replaced the part that had the number on it and just didn't replace that information.

The part I got is a round thing with a gasket around it that looks like it fits within a housing or something. I haven't even looked to see where this is supposed to go!

 

Should have done a search, first - found that it is the right part # - yeah, it was cheaper than I expected!

 

Sounds like it. Did you put it in yet?