This indicator light illuminates:
Hyundai Sonata LF 2014-2019 Owners Manual: Severe Driving Conditions
A- Repeatedly driving short distances of less than 5 miles (8 km) in normal temperature
or less than 10 miles (16 km) in freezing temperature
B- Extensive engine idling or low speed driving for long distances
C-Driving on rough, dusty, muddy, unpaved, graveled or saltspread roads
D-Driving in areas ...
Hyundai Sonata LF 2014-2019 Service Manual: Water Temperature Control Assembly Repair procedures
Removal and Installation
1.
Loosen the drain plug, and drain the engine coolant. Remove the radiator cap to drain with speed.
2.
Disconnect the battery negative terminal.
3.
Remove the air cleaner assembly.
(Refer to Intake and exhaust system - "Air Cleaner")
4.
Disconnect the wate ...