1. Start the engine.
2. Set the mode to the desired position. To improve the effectiveness of heating
and cooling : - Heating:
- Cooling:

3. Set the temperature control to the desired position.
4. Set the air intake control to the outside (fresh) air or recirculated air position.
5. Set the fan speed control to the desired speed.
6. If air conditioning is desired, turn the air conditioning system on.

Manual Climate Control System
Mode selectionHyundai Elantra AD (2016-2020) Service Manual: Center Pillar Trim Components and Components Location
Component Location
1. Center pillar lower trim2. Center pillar upper trim
...
Hyundai Elantra AD (2016-2020) Service Manual: Variable Intake Solenoid (VIS) Valve Repair procedures
Inspection
1.
Turn the ignition switch OFF.
2.
Disconnect the VIS valve connector.
3.
Measure resistance between VIS valve terminals 1 and 2.
Specification : Refer to "Specification"
Removal
1.
Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2.
...