Kia Optima: Air Conditioning System / Evaporator Temperature Sensor

Kia Optima DL3 2019-2021 Service and Repair Manual / Heating, Ventilation and Air Conditioning / Air Conditioning System / 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 resistivity of NTC will increase with decreasing temperature and decrease with increasing temperature.

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 (+)

Replacement
1.

Disconnect the negative (-) battery terminal.

2.

Remove the evaporator core assembly.

(Refer to Heater - "Evaporator Core")

3.

Remove the evaporator temperature sensor (A) from the evaporator core.

4.

To install, reverse the removal procedure.

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