Park the vehicle on a level surface and let the engine cool completely
Open the hood and locate the coolant reservoir and radiator cap
Place a drain pan under the radiator drain plug or lower hose
Remove the radiator cap only when the engine is fully cool
Open the drain plug or disconnect the lower radiator hose to drain the old coolant
Drain the coolant from the engine block if the vehicle requires it
Close the drain plug or reconnect the lower hose
Mix the new coolant with distilled water if required by the manufacturer
Fill the radiator with the correct coolant type and mixture
Fill the coolant reservoir to the proper level
Start the engine and set the heater to maximum heat
Let the engine run until it reaches operating temperature
Check for air bubbles and add coolant as needed
Shut off the engine and let it cool again
Recheck the coolant level in the radiator and reservoir
Top off the coolant if necessary
Inspect for leaks around hoses, drain plugs, and the radiator cap
Dispose of old coolant properly at a recycling or hazardous waste facility