Let the engine cool completely
Park on a level surface and set the parking brake
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 slowly
Open the drain plug or disconnect the lower radiator hose to drain the old coolant
Drain the coolant into the pan completely
Close the drain plug or reconnect the lower hose
Refill the system with the correct coolant type and proper water mix if required
Fill the radiator and coolant reservoir to the correct levels
Start the engine and turn the heater to maximum
Let the engine run until it reaches operating temperature
Check for air bubbles and add coolant as needed
Reinstall the radiator cap securely
Check for leaks around hoses, drain plug, and reservoir
After the engine cools again, recheck coolant level and top off if needed
Dispose of old coolant properly at a recycling or hazardous waste facility