radiator hose needs replacing. use and heat will cause hose to collapse when worn out
A water thermostat stuck open. Air in the heater hose lines (caused by low radiator coolant). Air temperature (mechanical) control cable not opening the heater hose water valve (under hood).
Remove the bottom radiator hose. Put a garden hose into the top of the radiator. Allow the garden hose to run until the water coming out of the bottom of the radiator is clear.
Lower radiator hose. It may be easier to use the drain plug located on the left hand side of the radiator. Its on the back of the radiator. Do not mistake the heater core for the radiator. The radiator is the one with the thick rubber hoses. To take off the lower radiator hose you have to remove the air filter box.
If your truck is overheating!!! Then check the upper radiator and lower radiator hose's , if the lower is cooler the the upper the either the thermostat is not opening or the radiator is clogged
The antifreeze is building up to much pressure you may have a cloged line or tour hose clamp is lose
Either the radiator hose is loose where it connects to the radiator or there is either a small hole in the radiator or in the radiator hose. Try checking the hose to see if it's loose or check for small holes in the hose or radiator.
I would suspect a busted hose or radiator. Should be very easy to find the source of the leak.
A leaking radiator hose would NOT cause this to happen, you have 2 problems with this vehicle.
A hole.
Check valve in radiator cap malfunction, replace radiator cap.
clogged radiator or bad water pump
Thermostat stuck closed.
It is supposed to blow out the outlet hose. I would assume you have a leak in that hose.
Probably an old hose that should have been replaced. Replace the hose, clamps and the radiator cap. Inspect the other hoses. The radiator cap should release pressure in excess of psi noted on cap, usually 15 to 17 psi.
Having a leak in a radiator hose will have no effect on the engine running or not. However, in time the hose leak will cause the level of the coolant in the radiator to drop below a critical level and the engine will overheat.
antifreeze keeps your car from overheating, it flows thru your radiator hose, without it your motor would blow