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.