Kia Rio: Air Conditioning System / Evaporator Temperature Sensor

Kia Rio 2017-2021 YB Service Manual / Heating,Ventilation, 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 freezing by excessive cooling.

Repair procedures
Inspection
1.

Turn the ignition switch OFF.

2.

Disconnect the evaporator temperature sensor connector.

3.

Measure resistance between terminal “+” and “-” of evaporator temperature sensor.

4.

Connect the evaporator temperature sensor connector.

5.

Run the engine and turn the A/C switch ON, then measure the voltage between the terminals of harness connector.

Specification

Evaporator core temperature [°C (°F)]
Resistance[kΩ]
-10 (14)
17.7 - 18.2
0 (32)
11.3 - 11.5
10 (50)
7.3 - 7.5
20 (68)
4.8 - 5.0
30 (86)
3.2 - 3.4
40 (104)
2.2 - 2.4

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 90° in a counterclockwise direction.

4.

Installation is the reverse order of removal.

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