If the LED lamp does not operate, have the vehicle checked by an authorized HYUNDAI dealer.
Hyundai Sonata LF 2014-2019 Service Manual: BLUE LINK Remote Control Repair procedures
Removal
1.
Remove the Electro chromic Inside rear view mirror.
(Refer to Electro Chromic Inside Rear View Mirror)
Installation
1.
Install the Electro chromic Inside rear view mirror.
(Refer to Electro Chromic Inside Rear View Mirror) ...
Hyundai Sonata LF 2014-2019 Owners Manual: Checking the Engine Coolant Level
WARNING
Never remove the radiator cap or the drain plug while the engine and radiator
are hot. Hot coolant and steam may blow out under pressure, causing serious injury.
Turn the engine off and wait until the engine cools down. Use extreme care
when removing the radiator cap. Wrap a thick towel ...