Park the car on a level surface.
Turn off the engine and allow it to cool down completely.
Remove the radiator cap.
Locate the drain plug on the bottom of the radiator.
Place a drain pan under the drain plug.
Open the drain plug and allow the coolant to drain into the drain pan.
Once the coolant has stopped draining, close the drain plug.
Reinstall the radiator cap.
It is important to note that the coolant system on a 98 Corsa is a closed system and should not be opened unless necessary. If you are not comfortable performing this task, you should take your car to a qualified mechanic.
