Why is your ford f150 still overheating after you change your antifreeze?
If your fanbelt is old, it may be slipping or loose. If so, replace it. Aaaaand, your thermostat could be stuck.
Also Check to make sure that your head gasket is not leaking, the exause could be heating, and boiling your coolant.
Antifreeze or water ( whatever you are using in the engine for cooling), will be leaking out and onto the engine and ground if the small hole in the front isn't plugged with oil or dirt. Otherwise it may go into the engine oil. If the impellar inside has stopped turning, you will notice that the engine will start overheating.
For a 1999 Ford F-150 ,4.6 L V8 : It came from the factory with a 50 / 50 mix of distilled water and GREEN color antifreeze ( meeting Ford specification ESE-M97B44-A ) 1 row radiator ( 10.3 U.S. quarts of antifreeze mixed with an equal amount of preferably distilled water ) 2 row radiator ( 11.55 quarts of antifreeze ) * Ford states not to exceed 60% antifreeze or drop below 40 % antifreeze…