How do you flush radiator on 1999 Mazda B3000?

To flush the radiator on a 1999 Mazda B3000, start by ensuring the engine is cool, then remove the radiator cap and place a drain pan under the radiator drain plug to catch the old coolant. Open the drain plug to let the old coolant flow out, and close the plug once it's drained. Next, fill the radiator with a mixture of water and radiator flush solution, run the engine for about 15 minutes, and then drain it again. Finally, refill the radiator with fresh coolant and ensure the system is bled of air before replacing the cap.