Car will not start after radiator hose reinserted into radiator & added coolant.

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We were driving on Route 15 this hot weekend and heard a pop sound. Opened hood and radiator hose was disengaged from radiator. As a result, coolant level was low. Car towed to nearest repair shop. They tested leak in radiator cap but cap was fine. Coolant added but car won't start now. Battery is okay. Why won't car start?