2012 Hyundai Tucson Owner's Manual - Page 311

Maintenance 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 malfunction or engine damage. • The engine in your vehicle has aluminum engine parts and must be protected by an ethylene-glycol-based coolant to prevent corrosion and freezing. • DO NOT USE alcohol or methanol coolant or mix them with the specified coolant. • Do not use a solution that contains more than 60% antifreeze or less than 35% antifreeze, which would reduce the effectiveness of the solution. For mixture percentage, refer to the following table. Mixture Percentage (volume) Ambient Temperature Water Antifreeze 5°F (-15°C) -13°F (-25°C) -31°F (-35°C) -49°F (-45°C) 35 40 50 60 65 60 50 40 Changing the coolant Have coolant changed by an authorized HYUNDAI dealer according to the Maintenance Schedule at the beginning of this section. CAUTION Put a thick cloth around the radiator cap before refilling the coolant in order to prevent the coolant from overflowing into engine parts such as the generator. OLM079007 WARNING Radiator cap WARNING - Coolant • Do not use radiator coolant or antifreeze in the washer fluid reservoir. • Radiator coolant can severely obscure visibility when sprayed on the windshield and may cause loss of vehicle control or damage to paint and body trim. Do not remove the radiator cap when the engine and radiator are hot. Scalding hot coolant and steam may blow out under pressure causing serious injury. 7 24