Water pump defective.
Could be a collapsed lower radiator hose, perhaps a bad thermostat.
are the cooling fans coming on
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
Low coolant level? System airbound? Cooling fan not working? Radiator plugged or restricted? Water pump not circulating coolant? Defective radiator cap?
Replace the Thermostat, and bleed all air from the cooling system.
Low coolant? Cooling fan not working? Bad thermostat? Cooling system airbound? Water pump not circulating coolant? Radiator core plugged or restricted? Bad radiator cap?
Sticking thermostat, blown head gasket, partially clogged radiator, or defective cooling fan.
There can be many causes of overheating. Clogged radiator, stuck thermostat, inoperable cooling fan, bad water pump, defective radiator cap, air trapped in cooling system, and blown head gasket.
could be the water pump That is a typical symptom of an air lock in the cooling system
Check the coolant level, the cooling system hoses and the radiator, if it's fine you need to check the thermostat.
IF IT WAS NOT OVERHEATING BEFORE THE HOSE WAS REPLACED -- MORE THAN LIKELY YOU HAVE AIR POCKETS TRAPPED IN YOUR COOLING SYSTEM
Bad thermostat maybe?