The high-pressure cooling system has a reservoir filled with year-round antifreeze coolant. The reservoir is filled at the factory.
Check the antifreeze protection and coolant level at least once a year, at the beginning of the winter season and before traveling to a colder climate.
Hyundai Sonata LF 2014-2019 Service Manual: Front Door Module Components and Components Location
Component Location
1. Front door module
...
Hyundai Sonata LF 2014-2019 Service Manual: Engine Cover Repair procedures
Removal and Installation
1.
Remove the engine cover (A).
2.
Install in the reverse order of removal. ...