Hyundai Ioniq (AE): Air Conditioning System / Evaporator Temperature Sensor. Repair procedures

Hyundai Ioniq (AE) 2017-2022 Service & Repair Manual / Heating, Ventilation and Air Conditioning / 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 [KΩ]
Voltage [V]
-10 (14)
43.35
2.96
0 (32)
27.62
2.40
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.
Remove the heater and blower assembly.
(Refer to Heater - "Heater Unit")
3.
Remove the evaporator core cover (A) after loosening the mounting screws.

4.
Pull out the evaporator temperature sensor (A) from the evaporator core.

5.
To install, reverse the removal procedure.
   
•
If you're installing a new condenser, add refrigerant oil (POE OIL).
•
Replace the O-rings with new ones at each fitting, and apply a thin coat of refrigerant oil before installing them. Be sure to use the right O-rings for R-134a to avoid leakage.
•
Be careful not to damage the radiator and condenser fins when installing the condenser.
•
Charge the system, and test its performance.
   
•
If the POE oil of the system gets mixed with PAG oil, then dielectric breakdown due to decreased volumetric resistivity can occur and inoperative A/C compressor may result, A/C compressor may not work.

    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.

    DescriptionThe 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.

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