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Thermostat change.


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I usually drain about 1/2 gallon into a clean bucket and then do just as dripley described. If the bucket is clean then you can reuse the coolant.

I changed mine so often w while back I never had any miles on the anti freeze to worry about it being to old. It never hurts to check while you are in there however.
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Keep us posted on your results...

I went on a trip 3.5 hrs one way in -10 F temps. Coolant ran between 198 and 206. I had my cardboard covering the rad. Iat was steady at 60. When idling it would cool down as low as 175 even with the fast idle on. As far as mpg's change I won't be able to tell. I've never really tracked that and my use of the truck is so varied from one day or week to the next.
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