One problem related to coolant leaking has been reported for the 2006 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Hyundai Sonata based on all problems reported for the 2006 Sonata.
Engine coolant leaks from the engine compartment unto the ground. Coolant began leaking 6 months after I purchased new 2006 Hyundai Sonata v6. Leaking stopped and has now started leaking again.