
The mode selection knob controls the direction of the air flow through the ventilation system.
Air can be directed to the floor, dashboard outlets, or windshield. Five symbols are used to represent Face, Bi-Level, Floor, Floor-Defrost and Defrost air position.
Face-Level (B, D)

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, D, C, E)

Air flow is directed towards the face and the floor.
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, side window defrosters, and side vents.
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, and side vents.
Defrost-Level (A, D)

Most of the air flow is directed to the windshield with a small amount of air directed to the side vents.
Heating and Air Conditioning
MAX A/C-Level (B, D)Hyundai Elantra AD (2016-2020) Service Manual: Canister Close Valve (CCV) Specifications
Specification
ItemSpecificationCoil Resistance (?)19.5 ~ 22.5 [20°C(68°F)]
...
Hyundai Elantra AD (2016-2020) Service Manual: Power Seat Control Switch Repair procedures
Inspection
Seat Control Switch
1.
With the power seat switch in each position, make sure that
continuity exists between the terminals below. If continuity is not as
specified, replace the power seat switch.
[Power Seat Control Switch]
Removal
1.
Disconnect the negative (-) battery ter ...