To be certain, you should:
* Consult your owner's manual: This is the most reliable source for the location of your specific vehicle's drain plug.
* Look closely at the bottom of the radiator: The plug is usually a small, threaded fitting, often with a cap or a slightly different finish than the surrounding metal.
Be prepared for some coolant to spill out when you open it, so have a drain pan ready underneath. The coolant will be hot if the engine has recently been running, so allow it to cool down before attempting to drain it.