Hyundai Elantra: Air Conditioning System / Evaporator Temperature Sensor Repair procedures

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 sensor.

Specification
Evaporator core temperature
[°C (°F)]
Resistance [K?]
Voltage [V]
-10 (14)
43.35
2.96
0 (32)
27.62
2.4
10 (50)
18.07
1.88
20 (68)
12.11
1.44
30 (86)
8.30
1.08
40 (104)
5.81
0.81

1. Sensor Ground
2. Evaporator sensor (+)

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 following information.
(1) Self diagnosis : Checking the failure code (DTC) and display.
(2) Current data : Checking the system input/output data state.
(3) Actuation test : Checking the system operation condition.
(4) Additional function : Other controlling such as he system option and zero point adjustment.
2.
Select the 'Car model' and the system to be checked in order to check the vehicle with the tester.
3.
Select the 'Current data' menu to search the current state of the input / output data.
The input/output data for the sensors corresponding to the Evaporator Temperature Sensor can be checked.

Replacement
1.
Disconnect the negative (-) battery terminal.
2.
Disconnect the evaporator temperature sensor connector (A).

3.
Remove the evaporator temperature sensor (A) by pulling it out after rotating it 90° in a counterclockwise direction.

4.
To intall, reverse the removal procedure.
Evaporator Temperature Sensor Description and Operation
Description The evaporator temperature sensor will detect the evaporator core temperature and interrupt compressor relay power in order to prevent evaporator from freezing by excessive cooling. ...

In-car Sensor Description and Operation
Description 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 ...

Other information:

Hyundai Elantra AD (2016-2020) Service Manual: Evaporator Temperature Sensor Description and Operation
Description The evaporator temperature sensor will detect the evaporator core temperature and interrupt compressor relay power in order to prevent evaporator from freezing by excessive cooling. The evaporator temperature sensor has the Negative Temperature Coefficient (NTC). Electrical re ...

Hyundai Elantra AD (2016-2020) Service Manual: Compressor oil Repair procedures
Oil Specification 1. The HFC-134a system requires synthetic (PAG) compressor oil whereas the R-12 system requires mineral compressor oil. The two oils must never be mixed. 2. Compressor (PAG) oil varies according to compressor model. Be sure to use oil specified for the model of compress ...

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