How to change the coolant in an Audi 80 1.8L?

I want to flush and change the coolant in my Audi 80 1.8L engine. How can I do this safely and efficiently?

To change the coolant, you will need to locate the radiator drain plug at the bottom of the radiator. Open it and let the old coolant drain out completely. Then, flush the system with a mixture of equal parts of distilled water and coolant. Finally, refill the system with the new coolant and bleed any air pockets out. Remember to dispose of the old coolant properly.