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I would think the truck would not run for an hour with a stuck thermostat. Is this a new problem that only happens with very cold weather? if so you may need to put some cardboard in front of the radiator

your heater core is stopped up, if the water does not flow, the hoses will stay cold. take both of them loose and see if you can flush some water through.

that is just a diverter that blows air three directions, will have nothing to do with the cold air issue. it is either your vent flap, side vents or a hole open behind the dash look at the diagnostic harness that goes through the firewall behind your trans dipstic to make sure the stopper is...

right above your vent box is where the glow plug harness wires come through for your diagnostic port. It is a 2 inch hole. from the outside, it is just below the resistor and towards the pasenger side about 4 to 6 inches from center. you can follow the diagnostic port wires to the hole from...

Make sure the rubber around your floor vents are good and that the vents are closing good, the two largest holes are where the speedo cable and the glow plug cables go through the fire wall. The rubber graumets for these come out pretty easy.