Hyundai Elantra AD (2016-2020) Service Manual: Refrigerant Line Repair procedures
Replacement
1.
If the compressor is marginally operable, run the engine at
idle speed, and let the air conditioning work for a few minutes, then
shut the engine off.
2.
Disconnect the negative (-) battery terminal.
3.
Recover the refrigerant with a recovery / charging station.
...
Hyundai Elantra AD (2016-2020) Service Manual: Auto Defoging Actuator Repair procedures
Inspection
1.
Turn the ignition switch OFF.
2.
Disconnect the auto defogging connector.
3.
Verify that the auto defogging actuator operates to the open
position when connecting 12V to terminal 3 and grounding terminal 4.
Verify that the auto defogging actuator operates to the close ...