You have two fan's on your truck, 1 is a fan clutch runs with the drive belt, 2 elec fan motor, with test light and engine running at normal temp, just a little bit above 1/2 way on your temp gauge check voltage at elec. cooling fan harness if you have voltage at one of the two wire's and fan don't turn on, bad cooling fan motor, on the fan clutch after you check voltage at elec. fan motor turn engine off, with your hand spin drive belt fan if it spin's freely bad fan clutch, replace it.Also check cooling level.Hope this was very helpful
Check the cooling fan for operation. the reason it cools down when you start moving is air is being forced thru the radiator [ram air or forced air]. at idle,air flow stops, this is where the engine cooling fan takes over,it is ether not working at all or working poorly[not spinning fast enough at idle]over heating will be aggravated if you are using the a.c, so for now don't use it.be sure to check coolant level, overheating can and will cause coolant loss.do a close inspection of cooling of cooling fan operation.
Sounds like radiator cooling fan not working when it gets hot see if fan at radiator is running
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