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Tonight it's not too cold here YET and the motivation kicked in, so I yanked the water pump off the beast just to see what she looked like, and it looks pretty foul. Lots of crusty formations on the impeller blades, and having it out in my hands, it's NOT spinning as smoothly and freely as it...

The site is back up... cool! I returned the stats I got at NAPA and went with the OEM Cummins 3913028. Turns out there's a Cummins distributor like 7 miles from my house. I'll be putting it all back together on Sunday, so we shall see....

Got it... I took pics of the plate. What's the CPL stand for?

I just walked over to where I have it parked and got the number as well as the build date

I was at NAPA tonight and was going to get the one that's supposed to be the compatible to the Cummins OEM stat, and I had my housing with me just to be sure it fit properly... and IT DIDN'T! Guess I'm getting mine straight from Cummins

Well that's the stat that was in there when I opened it up... probably the same as in yours

Okay, cool. Where on the engine is the ESN located?

And the stat in the pic was the top external stat, not from below... there wasn't one in there at all.

Hi Will. By ESN you mean engine serial # on the block? If yes, where would I locate it?

Point taken... and the weather here this week is supposed to be in the 40s-50s, so I think I'll be in good shape.

Well I already got the internal t-stat at Napa and it was only $14, and they're going to have the main external bypass stat in tomorrow, so I'll put them both in and hope for the best.

Look in the TM 9-2320-272-24-1, pages 3-192 thru-3-195

Okay, latest update - pulled the t-stat (p/n 3913028) and it looks pretty cruddy, and the internal bypass t-stat below there, well there wasn't even one in there! Could that be a factor with the loss of heat/temp rising?

Okay, coolant drained from rad. Nice brownish/greenish color but not nearly as bad as I expected. No evidence of oil in there either, Next, pulled the hose above the t-stat housing... nice, nasty, diarrhea brown crud! Getting ready to pull the housing after my coffee break.

Well. tomorrow I'll start off with draining the coolant, and hope that globs of crud come out of there and then try and flush the rad out and see what happens. I have a gut feeling there's blockage somewhere/ Let the truck run for like 30-45 min. today, and after the temp gauge hit around 150, I...

Hey Jason, thanks for the reply, and Merry Christmas! I'm in West Newton, not far from Washington, like 30 miles.

I hear ya. I'm a technician by trade and I've had bad parts that were brand new. One other thought... could there be air trapped in the system causing these issues> If so, what's the process to bleed out the air?

Well I guess a digital IR thermometer will be the next tool I buy! As to my temp gauge, it's brand new, just put it in like 4 or 5 weeks ago.

Also forgot to say that I've never seen the fan kick in. From what I've read the shutterstat should engage at around 190-200, and the temp gauge (which is new since the one that was in the truck when I got it never worked) in the cab shows I've reached that or above,

Hi Will, and thanks much for the reply and info! As you may have seen in my post, I'm basically a 'newbie' and this baby is my first MV. I failed to include one detail on here - there was a coolant leak from the inlet line from the block to the air compressor (see TM 9-2320-272-24-1, page 3-169)...