Do you leave it sit outside and run or do you drive it around and it still takes half and hour to warm up?
Water pump defective.
If your radiator isnt leaking and car is having a over heating problem and coolant spewing out. Chances are your thermostat needs replaced. possible the radiator needs to be flushed. But more likley its thermostat
cooling system needs flushed out and a new thermostat installed, also if the radiator is still original it probably needs replaced or rodded out.
Could be your electric fan on the radiator is shot, or the relay is bad.
you must be a wierdo.stupid.
Have flushed complete cooling system replaced water pump radiator thermostat clutch fan added 2gal straight anti freeze then filled to capacity with water and truck is still over heating. What else could possibly be wrong
you might want to check for a blown head gasket or a cracked head or block. espically if it loosing water out of the radiator with out leaking on the ground.
Test gauge function with a mechanical gauge to get actual engine temp.
Low coolant? System air bound? Hoses collapsing under pressure? Water pump not circulating coolant?
System airbound? Coolant level? Temperature control cable?
It could be a clogged radiator or cracked head or bad head gasket.
The radiator can be flushed with water running continuously. This will flush out any loose particles. The only way to completely clean the radiator is to have is professionally cleaned in a chemical bath.