
The mode selection button controls the direction of the air flow through the ventilation system.
The air flow outlet port is converted as follows:

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, E, C)

Air flow is directed towards the face and the floor.
Floor-Level (C, A, 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.
Floor/Defrost-Level (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.

Defrost-Level (A, D)
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 horizontal thumbwheel. To close the vent, rotate it left to the maximum position.
To open the vent, rotate it right to the desired position.
Also, you can adjust the direction of air delivery from these vents using the vent control lever as shown.
Manual heating and air conditioning
Temperature controlHyundai Tucson (LM) 2010-2015 Service Manual: Condenser Repair procedures
Inspection
1.
Check the condenser fins for clogging and damage. If clogged,
clean them with water, and blow them with compressed air. If bent,
gently bend them using a screwdriver or pliers.
2.
Check the condenser connections for leakage, and repair or replace it, if required.
Replace ...
Hyundai Tucson (LM) 2010-2015 Service Manual: Repair procedures
Removal
1.
Remove the liftgate trim in the trunk after removing the screws and clips.
(Refer to the BD group - "Liftgate")
2.
Remove the liftgate garnish (A) after disconnecting the connector and removing the nuts.
3.
Remove the back view camera (A) after loosening the screws (2EA).
...