This is my first time in this forum so hello all.
A little history, I have an 02 Dakota 4 door 5.9 V8. I had a new water pump and gasket, new heads & gaskets replaced about 4 months ago. Now all of the sudden the truck is starting to get to high temps on the highway at higher speeds. Runs fine at lower speeds. Any thoughts or suggestions would be great!

did they replace the t stat maybe the clutch fan is bad it should not spin freely when you spin it by hand