First, remove the radiator cap. Look at it, if it's rusty of the rubber gasket is torn or cracked get a new one. Next locate the radiator draincock on the bottom of the radiator. Turn it counter clockwise until it opens. Many of these are plastic so it may be a good idea to have a spare standing by in case it breaks. If you can't find the draincock or can't open it don't worry. If it did open drain a little antifreeze then close it, you just want enough to examine. If the antifreeze looks rusty you may want to take the car to a radiator shop or service center and have the entire cooling system and engine power flushed.
Now, pour the flush chemical in to the radiator and start the engine. Read the directions on the flush bottle. After the engine reaches operating temp and the thermostat opens go ahead and open the draincock or loosen the lower hose if its stuck. Use pliers and wear gloves when doing this because the fluid coming out is heated over 200 degrees. Always wear safety glasses too. Okay we're halfway done. While the radiator drains put a water hose in the radiator and turn it on to make sure that fluid is running into the radiator as well as coming out. If you don't the engine can quickly overheat. Also, always make sure that the engine is running when you add anything to the radiator, failure to do so can result in a cracked engine block.
Watch the flow of liquid coming out of the radiator When it looks clear, close the draincock or reattach the lower hose. Remove the water hose from the radiator and begin to add antifreeze. Check your owner's manual for the amount to add. Remember, you want a 50/50 mixture of antifreeze and water. Look on top of the thermostat housing and see if your car has a bleed valve. IF it does open it now. This allows air that is trapped in the cooling system to escape.
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