This indicator light illuminates:
Hyundai Sonata LF 2014-2019 Service Manual: Refrigerant Line Repair procedures
Replacement
1.
If the compressor is marginally operable, run the engine at
idle speed, and let the air conditioning work for a few minutes, then
shut the engine off.
2.
Disconnect the negative (-) battery terminal.
3.
Recover the refrigerant with a recovery/charging station.
4.
...
Hyundai Sonata LF 2014-2019 Owners Manual: With Tire Mobility Kit (TMK, if equipped) - Type A
For safe operation, carefully read and follow the instructions in this manual
before use.
(1) Compressor
(2) Sealant bottle
The Tire Mobility Kit is a temporary fix to the tire and the tire should be inspected
by an authorized HYUNDAI dealer as soon as possible.
CAUTION
One sealant bottle for one ...