Where's it blowing out from? Radiator cap could be bad(cheap to replace). Check the hose leading from the radiator cap to the overflow tank as well, it could be blocked(also cheap to replace). Other than that it should work fine.
Radiator hoses will wear out and collapse due to the vaccumn affect of the water pump. If any hoses look sucked in, replace them.
Other thing that comes to mind, mineral build up from using tap water will clog the radiator.
My first thought was the radiator cap as well. Go ahead and replace the thermostat, hoses and have a radiator shop clean/flush and pressure test your radiator. It's not expensive if you do the work yourself.
The truck isn't over heating but its the water pump we used a pressure tester and it showed a constantly leak under pressure I'm gonna also flush the system so it will run into the overflow tank if needed