The heating and cooling system can be controlled manually by pushing buttons other than the AUTO button. In this case, the system works sequentially according to the order of buttons selected.
When pressing any button except the AUTO button while using automatic operation, the functions not selected will be controlled automatically.
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 position.
5. Set the fan speed control to the desired speed.
6. If air conditioning is desired, turn the air conditioning system on.
7. Press the AUTO button in order to convert to full automatic control of the system.

Automatic Heating and Air Conditioning
Mode selectionHyundai Elantra AD (2016-2020) Service Manual: Description and Operation
Description
The SMART KEY system is a system that allows the user to
access and operate a vehicle in a very convenient way. To access the
vehicle, no traditional key or remote control unit is needed.
The user carries a SMART KEY FOB which does not require any
conscious actions by the user ...
Hyundai Elantra AD (2016-2020) Owners Manual: Exterior Overview
■ Front view
1. Hood
2. Windows
3. Sunroof
4. Wiper blade
5. Tires and wheels
6. Front lamps
7. Side repeater lamp
■ Rear view
1. Door lock
2. Trunk
3. Fuel filler door
4. Side view mirror
5. Antenna
6. Rear lamps ...