The mode selection button controls the direction of the air flow through the ventilation system.
The air flow outlet direction is cycled as follows:
Face-Level (B, D, F)
Air flow is directed toward the upper body and face. Additionally, each outlet can be controlled to direct the air discharged from the outlet.
Bi-Level (B, C, D, E, F)
Air flow is directed towards the face and the floor.
Floor & Defrost (A, C, D, E)
Most of the air flow is directed to the floor and the windshield with a small amount directed to the side window defrosters.
Floor-Level (A, C, D, E)
Most of the air flow is directed to the floor, with a small amount of the air being directed to the windshield and side window defrosters.
Defrost-Level (A)
Most of the air flow is directed to the windshield with a small amount of air directed to the side window defrosters.
Instrument panel vents
The outlet vents can be opened () or closed () separately using the thumbwheel.
Also, you can adjust the direction of air delivered from these vents using the vent control lever as shown.
Hyundai Sonata LF 2014-2019 Owners Manual: Head Restraints
The vehicle’s front and rear seats have adjustable head restraints. The head
restraints provide comfort for passengers, but more importantly they are designed
to help protect passengers from whiplash and other neck and spinal injuries during
an accident, especially in a rear impact collision.
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Hyundai Sonata LF 2014-2019 Service Manual: Specifications
Specifications
DescriptionSpecificationsLimitGeneralTypeIn-line, DOHC?Number of cylinders4?Bore77mm (3.0315in)?Stroke85.44mm (3.3638in)?Total displacement1,591 cc (97.09 cu.in)?Compression ratio9.5 : 1?Firing order1-3-4-2?Valve timingIntake valveOpensATDC 8°/BTDC 42°?ClosesABDC 69°/ABDC 19° ...