Hyundai Sonata (2009)

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    Recommended Engine Coolant
    When adding coolant, use only deionized water or soft water for your vehicle and never mix hard water in the coolant filled at the factory. An improper coolant mixture can result in serious malfun ...

    Shop manual
    A Hyundai Shop Manual is available from your authorized Hyundai dealer. It's written for professional technicians, but is simple enough for most mechanically-inclined owners to understand. ...

    Horn
    To sound the horn, press the horn symbol on your steering wheel. Check the horn regularly to be sure it operates properly. NOTICE To sound the horn, press the area indicated by the horn symbol on ...