The truck doesn't get warm. Why are so many people looking at the radiator to begin with? Is the OP interested in radiator temps, or in why the truck doesn't get to normal temperature? _________________________________________
Good point, aarcuda. The OP's inquiry was ambiguous.
''My truck won't get warm'' could actually mean there is no cabin heat, leading to a fix involving the heater core, air flappers, heater valves, fan resistors, etc.
The OP mentioned that squeezing the radiator hoses got a higher (radiator?) temperature, so I posted some basic thermostat hints, rather than asking him for a better description of the problem or symptoms.
If I misinterpreted the problem I hope he will post again with more information.
Rodan.