Quote:
Originally Posted by Tate
This.
My 12v gauge always says its running cold. The previous owner installed a separate water temp gauge under the dash. When I first bought the truck, it would run from 170-190 for hours on end, always up and down. A big rad will do that. That t-stat died on me about 2 years ago, got another one from Cummins, this one hold temp real steady, usually cools down when I'm coming off the highway slowing down in the winter.
I wouldn't worry about it. Your truck isn't the first to do it, and it won't be the last.
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I did check my tstat housing with a laser temp gun before returning the cummins tstat. I know that's definitely not the most accurate way, but it was easy and free. It did stay cool (130deg-ish). I should go check it again with the new one from Napa that stays a lot closer to 190deg.
Quote:
Originally Posted by haloman
What Tate said. Got to keep in mind these truck were designed to keep cool in 100deg heat while at max capacity.
Custom cardboard insert with a hole cut in the middle always did the trick for me.
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If you put cardboard in there, it will take a ton of the efficiency away from the intercooler though. I played around with it a few years ago. I went and bought 1/4" insulation board, then cut it into four lengths that I could sit inbetween the radiator and intercooler and my mileage went from 22 to 19mpg. I didnt feel a difference in warm up time really and no difference in power, but the mileage was the only big change. Maybe I'll mess around with the idea again. I also want to go to an electric fan because I have a feeling that my fan is stuck on.