2013 Hyundai Sonata Owner's Manual - Page 133

Features of your vehicle CAUTION Do not operate the engine within the tachometer's RED ZONE. This may cause severe engine damage. WARNING Never remove the radiator cap when the engine is hot. The engine coolant is under pressure and could cause severe burns. Wait until the engine is cool before adding coolant to the reservoir. H OYF049047 Engine temperature gauge This gauge shows the temperature of the engine coolant when the ignition switch is ON. Do not continue driving with an overheated engine. If your vehicle overheats, refer to "If the engine overheats" in section 6. CAUTION If the gauge pointer moves beyond the normal range area toward the "H" position, it indicates overheating that may damage the engine. 4 52