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you need to first jack up the front of your car and remove the splash guard that covers the bottom of the engine/ radiator. (this should be held on by a few plastic fasteners in the wheel wells and on the front bumper). after that is out of the way locate the bottom of the radiator which is actually suspended slightly up in a metal casing. once you have found it go to the drivers side of the radiator and there should be a hole in this housing. if you look up into the hole you will see a bolt, that is the drain for the radiator. as a side note, the coolant doesn't come cleanly out of the car like oil does. it hits the housing that holds the radiator and splashes about, so make sure you have a large enough bucket to collect it all.
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