Instead of changing the T-stat remove your fan for the winter, many of us have done it with excellent results. Besides faster warm-ups and a better heater your truck will run quieter with more low end power. My coolant temp has never gone over 190° fanless even when it's 85° outside. All you need to remove is the fan, it comes out the top without removing anything else even though it doesn't look like it. Looking at it from the truck front, hit the large fan nut a couple of times with a long drift and hammer on the right side of the nut flat, then put a 1-7/16" or 1-1/2" wrench on the nut and hit it to the right. It is a left hand thread. Once it breaks loose you can unscrew it by hand and pull it out the top while pushing the upper radiator hose out of the way. If the pulley wants to turn you can hold it with a large pair of Channel-Locs on the non belt part or use a 3/8" breaker bar on the belt tensioner to tighten the belt. Store the fan upright so the oil doesn't come out. Do this when the engine is cool. Try it, you'll love it.