While the engine is running, push either of the switches to warm the rear seat.
During mild weather or under conditions where the operation of the seat warmer is not needed, keep the switches in the OFF position.
Each time you push the switch, the temperature setting of the seat is changed as follows :
The seat warmer defaults to the OFF position whenever the ignition switch is placed in the ON position.
Information
With the seat warmer switch in the ON position, the heating system in the seat turns off or on automatically depending on the seat temperature.
Hyundai Elantra AD (2016-2020) Service Manual: Condenser Repair procedures
Inspection
1.
Check the condenser fins for clogging and damage. If clogged,
clean them with water, and blow them with compressed air. If bent,
gently bend them using a screwdriver or pliers.
2.
Check the condenser connections for leakage, and repair or replace it, if required.
Replace ...
Hyundai Elantra AD (2016-2020) Service Manual: Vacuum Pump Components and Components Location
Components
[UII 1.6]
1. Camshaft bearing cap2. Camshaft3. Camshaft sprocket4. Vacuum pump5. Vacuum pump gasket
...