Kia Rio: Heating,Ventilation, Air Conditioning / Ambient Temperature Sensor

Kia Rio 2017-2021 YB Service Manual / Heating,Ventilation, Air Conditioning / Ambient Temperature Sensor

Description and operation
Description

The ambient temperature sensor is located at the front of the condenser and detects ambient air temperature. It is a negative type thermistor; resistance will increase with lower temperature, and decrease with higher temperature.

The sensor output will be used for discharge temperature control, temperature regulation door control, blower motor level control, mix mode control and in-car humidity control.

  

If the ambient temperature is below 1.0°C (33.8°F), the A/C compressor will be stopped.The compressor will be operated by manual operating.

Repair procedures
Inspection
1.

Turn the ignition switch OFF.

2.

Disconnect ambient temperature sensor.

3.

Check the resistance of ambient temperature sensor between terminal “+” and “-” whether it is changed by changing of the ambient temperature.

Specification

Ambient temperature [°C(°F)]
Resistance [kΩ]
Voltage [V]
-30(-22)
507
4.720
-20(-4)
284.5
4.522
-10(14)
164.2
4.225
0 (32)
97.5
3.821
10 (50)
59.6
3.322
20 (68)
37.46
2.772
30(86)
24.18
2.227
40(104)
16
1.735
50(122)
10.83
1.323

4.

If the measured resistance is not specification, substitute with a known-good ambient temperature sensor and check for proper operation.

5.

If the problem is corrected, replace the ambient temperature sensor.

Replacement
1.

Disconnect the negative (-) battery terminal.

2.

Remove the front bumper.

(Refer to Body - "Front Bumper Assembly")

3.

Disconnect the ambient temperature sensor connector (A).

4.

Remove the ambient temperature sensor (A).

5.

Installation is the reverse order of removal.

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