How do you flush radiator on 2002 Mercury Cougar?

To flush the radiator on a 2002 Mercury Cougar, first ensure the engine is cool and then remove the radiator cap. Place a drain pan under the radiator and remove the drain plug at the bottom to let the old coolant flow out. After draining, close the drain plug, fill the radiator with a radiator flush solution mixed with water, run the engine for about 10-15 minutes, and then drain again. Finally, refill with fresh coolant and check for leaks.