buy a cooling system flush kit from walmart.. i believe their only like $4... follow the directions on the package to install the T fitting in the heater hose line.. just really follow the directions on the package, then refill the coolant with the proper mix of coolant/water or premixed coolant.. remember to idle the engine for about 10-15 mins with the radiator cap off to "BURP" the system after refilling the radiator....