RepairPal Certified shops can diagnose and repair your 2003 Hyundai Sonata. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
does not have a heater control valve on the coolant hoses.check the coolant level,it MUST be full to get heat,both heater hoses should be VERY HOT when the engine is at normal operating temperature to try and hold in your hands.