Originally Posted by
tortron
Cooling down when moving tells us that either the radiator or fan isn't up to scratch.
I don't recall if you replaced the rad on this, but if not it could probably do with being taken to a shop for rodding out to clear the tubes.
You will probably find that 30 percent of the tubes are gummed up.
Also check that your fan is still in one piece, i.e. it hasn't lost any of its blades, and that the clutch is activating. I.e is it turning at a good speed at idle when the truck has warmed up? If not you may need a new fan clutch, or swap to an electric unit
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