Kia Rio: Air Conditioning System / Evaporator Temperature Sensor

Kia Rio 2017-2023 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.

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.

❮A/C Pressure Transducer

Description and operation Description The A/C Pressure Transducer (APT) convert the pressure value of high pressure line into voltage value after measure it.

Photo Sensor (FATC only)❯

Description and operation Description The photo sensor is located at the center of defrost nozzles. The photo sensor contains a photovoltaic (sensitive to sunlight) diode.

Other information:

Kia Rio 2017-2023 YB Service Manual: A/C Pressure Transducer

Description and operation Description The A/C Pressure Transducer (APT) convert the pressure value of high pressure line into voltage value after measure it. By converted voltage value, engine ECU controls cooling fan by operating it high speed or low speed.

Kia Rio 2017-2023 YB Service Manual: Climate Control Air Filtar