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my Haynes manual for my '07 Sonata says in order to drain all coolant from the system I first open drain plug at bottom of the radiator (done that), then remove drain plug on the engine to drain coolant from the block. however the book doesn't show me where this engine drain plug is located. do I need to just disconnect a hose from the block to drain coolant within the block or is there an actual drain plug that's eluding me?