Quote:
Originally Posted by Hart_Rod
You should be able to see the water in the radiator "churning/flowing" once the thermostat opens up (195/200F). If you are not, then you have a restriction in the coolant system, either thermostat or radiator. Personally, I would just pull your current thermostat and leave it out. Restart truck, leave the radiator cap off and let it warm up. If it's still getting hot and you can't see the flow in the radiator, then then you have a radiator restriction. If you do see good flow, it's your thermostat.
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A most excellent suggestion, I will do this next and report back.
Thank you