There is a tap at the bottom of the radiator. Open it up and you will find the coolen is coming out (use a pan to collect it). Then open the safety cap on top of your ratiator aswell to fill the water over there (Water is to clean up the dirt inside the cooling system of your engine). Then start you engine and close the tap at the bottom and leave the safety valve open. Wait awhile until the water warn up to abit hot. Then open the tap and let the water goes again, remember to keep filling up the water into the radiator. Keep this cycle for few times and when you see the water is out frow the tap are clean and clear. Then you can open the tap and let the water all goes away. Once the water was drain out, switch off your engine. Close the tap and then fill it up with the new coolen! After you fill it up, start the engin and keep filling it to the top and it will be top up arounf 5 mins later! The last thing is make sure all the tap and safety valve are secure!