I have an 04.5 with the factory antifreeze, cap, thermostat, and water pump.. I checked the coolant integrty and the boiling point is 286 deg and the freeze protection is - 45. Truck never runs hot, heat works great etc.. The guestion I have is I can lay my hand on the radiator cap after diving at 70 for an hour and it's barely warm? The top hose is hot and pliable, the bottom hose is warm. I came across this by accidentally laying my hand on the cap, which surprised me. Any thoughts?