Hyundai Elantra: Air Conditioning System / In-car Sensor
Description and operation
The In-car air temperature sensor is built in the heater & A/C control unit.
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 in-car temperature to intended value.
Components and components location

Repair procedures
1. | Disconnect the negative (-) battery terminal. |
2. | Remove the Heater & A/C Control Unit. (Refer to Controller - "Heater & A/C Control Unit (DATC)") 
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3. | To install, reverse the removal procedure. |
Description and operation
DescriptionThe evaporator temperature sensor will detect the evaporator core temperature and interrupt compressor relay power in order to prevent evaporator from freezing by excessive cooling...
Description and operation
Description 1.The photo sensor is located at the center of the defrost nozzles.2.The photo sensor contains a photovoltaic (sensitive to sunlight) diode...
Other information:
Repair procedures
Removal1.Remove the front door trim.(Refer to Front Door - "Front Door Trim")2.Cut the heat-welded part with a knife and loosen the mounting screw (B).3.Remove the front door inside handle (A).
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Be careful of breakage and cut the heat-welded part with a knife...
The SRS is virtually maintenance-free
and there are no parts you can safely
service by yourself. If the SRS air bag
warning light does not illuminate when
the ignition switch is in the ON position,
or continuously remains on, have your
vehicle immediately inspected by an
authorized HYUNDAI dealer...