Temp gage is not moving, but the truck is not overheat yet...what should be done at this point? thx. Cy

1 cubic yard (CY) =.7645543 ( decimal point 76)cubic meters ( M3) so for example 10 CY @$1.00 per CY = $10.00 =$ 7.60 per cubic meter

What relays are you removing? If you remove the radiator fan relay, the vehicle will overheat. Does the temp guage move at all/very little? IF so suspect a thermostat problem. A thermostat that is stuck open will cause little/poor heat as well as the temp guage to stay on the cold side

the usual suspects are:
stuck shut thermostat
clogged raiator
dead water pump
low coolant level
it's sunday, rovers don't work on sunday.
Then again, maybe its wednesday, rovers take half a day then.

If there is cold air coming out the heater than there is air in the system. After you replaced the thermostat did you run the engine at idle with the radiator cap off until the engine came up to operating temp? Doing this will purge the air from the system.

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First I suggest to check coolant level; could be a wrong about engine coolant temperature sending unit go to bad.

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Have you checked your radiator cap maybe its not building pressure.

There is a separate sensor for the fan and the temp gauge. Change the cooling fan "switch". Its really just another temp sensor.

probably,the thermostat is not opening to allow water in to the engine

TEMP GAUGE SHOULD STAY IN MIDDLE.IF ITS MOVING UP A LITTLE CLOSE TO RED.CHANGE THERMOSTAT AND RADIATOR PRESSURE CAP MINE RELATIVE CAR DONE THE THE SAME.I REPLACED THEM BOTH -.WARNING IF ITS YOUR FIRST TIME LET A GARAGE DO IT BECAUSE YOU GOING TO HAVE TO TAKE THROTTLE BODY OFF.TO GET TO THERMOSTAT.THEN COOLANT SYSTEM IS GOING TO TO BE BLEED.TO KEEP ENGINE FROM OVER HEATING.IF YOU BEEN USE TO WORKING ON CARS. ALL IS GOOD.

Are you mistaking the engine temp sensor for the engine temp sending unit? The temp sensor is for the fuel injection system and the temp sending unit is for the gauge. If you asked for a sensor thats what they sold you. You need to ask for a sending unit.