I just started noticing my truck over heating even on short drives. I got under the hood and noticed a small pressure leak in the radiator. Took the radiator and replaced it with warranty, filled it with fresh coolant, the whole nine.

The problem persists. I don't have any ideas so far of what else it could be. The thermometer was replaced one year and two months ago. Anyone else have this problem before?

 

Yes, numerous threads here with similar problem and search will turn them up.

Check the fan clutch, water pump, radiator cap, and for loss of coolant. Also, thermostat may be sticking shut.