i could go on forever but i have no idea about what to do on this problem, the other problems i have had wit it i have luckily fixed my self like first bought it used it leaked antifreeze so i changed the water pump that was fun only everything had to come off top of engine, then minor brake job then starter went out, then the clickin noise under the dash after gettin in truck or after i turn the truck off and open the door that was a loose positive connector at the battery then found out the battery wasn't enough cold crankin amps then the heat problem wit too kids in the cold and a wife dat was naggin my ass to get it fixed i flushed just the heater core and i got heat but still 1/4 on the temp gauge even after thermostat,temp sensor, checkin the clutch on the fan when cold it should not move much and even card board in front of truck im almost bout to say "i quit", or "junk it" i mean im a man so i should be able to fix anything but damn i guess i do need help i just know temp gauge aint normal and it pisses me off.