How do you flush cooling system for 1992 Toyota Previa?

To flush the cooling system of a 1992 Toyota Previa, start by ensuring the engine is cool and then remove the radiator cap. Drain the old coolant by opening the drain valve at the bottom of the radiator and allowing the fluid to flow out. Next, fill the radiator with a mixture of water and a cooling system flush solution, run the engine until it reaches operating temperature, and then let it cool before draining again. Finally, refill the system with fresh coolant, ensuring to bleed any air out of the system by running the engine with the radiator cap off until the thermostat opens.