Turn your car on and let it warm up for about 5-10 minutes. You want to wait until your thermostat opens, and allows coolant to circulate through your system.
There is a bleeder valve that allows air to escape so not to be trapped in a high spot in the cooling system above the thermostat. Loosing this slightly will allow the air to bleed out of the system. You can re-close it as soon as you see coolant leaking from it.
After it is cool, top off the coolant again by filling up the radiator and checking the coolant reservoir. Keep an eye open for leaks and check your coolant reservoir occasionally over the next couple days.
Never open the radiator cap while the engine is hot. Pressurized steam can cause serious injury.
You are done!
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