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: Curtain Airbag (CAB) Module Repair procedures
Removal
1.
Disconnect the battery negative cable and wait for at least 3 minutes before beginning work.
2.
Remove the roof trim.
(Refer to Body - "Roof Trim Assembly")
3.
Remove the curtain airbag (A) after disconnecting the curtain airbag harness connector (B) and loosening the mounti ...
Hyundai Elantra AD (2016-2020) Service Manual: Repair procedures
Replacement
•
When removing the fender, wrap protective tape around a screwdriver or remover not to damage components
•
Put on gloves to prevent hand injuries
•
When removing the clips, use a clip remover.
1.
Remove the fro ...