Hyundai Santa Fe (TM): Air conditioning System / Ambient Temperature Sensor. Repair procedures

Hyundai Santa Fe (TM) 2019-2023 Service and Repair Manual / Heating,Ventilation And Air Conditioning / Air conditioning System / Ambient Temperature Sensor. Repair procedures

Inspection
1.
Check the resistance of the ambient temperature sensor between terminals 1 and 2 whether it changes by changing the ambient temperature.

1. Ambient Sensor (+)

 2. Sensor ground

Specification
Ambient temperature [°C (°F)]
Resistance between terminals 1 and 2 (kΩ ± 3%)
-30 (-22)
 480.41
-20 (-4)
 271.21
-10 (14)
 158.18
0 (32)
 95.1
10 (50)
 58.8
20 (68)
 37.32
30 (86)
 24.26
40 (104)
 16.13
50 (122)
 10.95

2.
If the measured resistance is not within specification, substitute with a known-good ambient temperature sensor and check for proper operation.
3.
Replace the ambient temperature sensor if it is proved that there is a problem with the sensor.
Replacement
1.
Disconnect the negative (-) battery terminal.
2.
Remove the front bumper.
(Refer to Body - "Front Bumper Assembly")
3.
Disconnect the connector (A) and then remove the ambient temperature sensor (B).
4.
Install in the reverse order of removal.

    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.

    Description The auto defogging sensor is installed on the front window glass. The sensor judges and sends signal if moisture occurs to blow out wind for defogging.

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