Hyundai Sonata: Air Conditioning System / In-car Sensor Description and Operation
The sensor contains a thermistor which measures the
temperature of the inside. The signal decided by the resistance value
which changes in accordance with perceived inside temperature, is
delivered to heater control unit and according to this signal the
control unit regulates incar temperature to intended value.
When changing the resistance value by sensing the temperature
caused by intake indoor air, the corresponding voltage is transmitted
to the thermostat module.

Inspection
1.
Turn the ignition switch OFF.
2.
Disconnect the evaporator temperature sensor connector.
3.
Measure the resistance between terminal "+" and "-" of the evaporator temperature ...
Diagnosis With GDS
1.
The heating, ventilation and air conditioning can be quickly diagnosed failed parts with vehicle diagnostic system (GDS).
? The diagnostic system (GDS) provides the follow ...
Other information:
Hyundai Sonata LF 2014-2019 Service Manual: Brake Pedal Repair procedures
Removal
1.
Turn ignition switch OFF and disconnect the negative (-) battery cable.
2.
Remove the crash pad lower panel.
(Refer to Body - "Crash Pad")
3.
Remove the knee air bag.
(Refer to Restraint - "Knee Airbag(KAB) Module")
4.
Disconnect the stop lamp switch connector (A), and ...
Hyundai Sonata LF 2014-2019 Owners Manual: Additional Safety Precautions
Passengers should not move out of or change seats while the vehicle is moving.
A passenger who is not wearing a seat belt during a crash or emergency stop can
be thrown against the inside of the vehicle, against other occupants, or be ejected
from the vehicle.
Do not use any accessories on seat b ...