also...before you do that take the upper radiator hose off (from the radiator side-leave the hose conected to the water neck) and the radiator cap. then dry off any antifreez from the hose...put your mouth on it and blow...water should come out of the radiator from where you took the cap off...you may have to take the thermostat out of the water neck...then put the waterneck back on with out the thermostat removed and do what is said above. when you blow and nothing comes out of the radiator then you need to look else where for the problem