You can start the engine without inserting the key.
NOTICE
To prevent damaging the smart key:
NOTICE
Always have the smart key with you when leaving the vehicle. If the smart key is left near the vehicle, the vehicle battery may be discharged.
Hyundai Sonata LF 2014-2019 Service Manual: Coolant Repair procedures
Replacement And Air Bleeding
Never remove the radiator cap when the engine is hot. Serious
scalding could be caused by hot fluid under high pressure escaping from
the radiator.
When pouring engine coolant, be sure to shut the relay box
lid and ...
Hyundai Sonata LF 2014-2019 Service Manual: Front Door Window Glass Repair procedures
Replacement
1.
Remove the front door trim.
(Refer to Front Door - "Front Door Trim")
2.
After loosening the mounting screws, then remove the front door belt inside weatherstrip (A).
3.
By operating the power window switch, fall down until seeing the glass mounting bolt on plug hole.
...