On the bottom of your radiator (pictured below), there's a petcock (also pictured below). Turn the petcock counter clockwise to open the spigot and allow the coolant/antifreeze to empty from the radiator. Once empty, tighten the petcock again and refill.
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On the bottom of your radiator (pictured below), there's a petcock (also pictured below). Turn the petcock counter clockwise to open the spigot and allow the coolant/antifreeze to empty from the radiator. Once empty, tighten the petcock again and refill.