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.
Hyundai Tucson (LM) 2010-2015 Service Manual: Repair procedures
Refrigerant System Service Basics
Refrigerant Recovery
Use only service equipment that is U.L-listed and is
certified to meet the requirements of SAE J2210 to remove
HFC-134a(R-134a) from the air conditioning system.
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Air conditioning refrigerant or lubricant vapor ...
Hyundai Tucson (LM) 2010-2015 Owners Manual: 90,000 miles (144,000 km) or 72 months
Rotating tires
Inspect vacuum hose
Inspect air conditioning refrigerant
Inspect brake hoses and lines
Inspect drive shafts and boots
Inspect exhaust pipe and muffler
Inspect front brake disc/pads, calipers
Inspect propeller shaft (AWD)
Inspect rear brake disc/pads
Inspect steeri ...