Hyundai Elantra: Air Conditioning System / Ambient Temperature Sensor

Hyundai Elantra (CN7) 2021-2025 Service Manual / Heating, Ventilation and Air Conditioning / Air Conditioning System / 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.

Repair procedures

Inspection

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

Sensor resistance

Ambient temperature [°C (°F)]	Resistance between terminal 1 and 2 (kΩ)
-30 (-22)	480.41
-20 (-4)	271.21
-10 (14)	158.18
0 (32)	95.096
10 (50)	58.799
20 (68)	37.315
30 (86)	24.26
40 (104)	16.13
50 (122)	10.95

1. Ambient Sensor (+)
2. Sensor ground

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.	To install, reverse the removal procedure.

Photo Sensor

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Tire Rotation

To equalize tread wear, HYUNDAI recommends that the tires be rotated according to the maintenance schedule or sooner if irregular wear develops.

During rotation, check the tires for correct balance.

When rotating tires, check for uneven wear and damage. Abnormal wear is usually caused by incorrect tire pressure, improper wheel alignment, out-ofbalance wheels, severe braking or severe cornering. Look for bumps or bulges in the tread or side of the tire. Replace the tire if you find any of these conditions. Replace the tire if fabric or cord is visible. After rotation, be sure to bring the front and rear tire pressures to specification and check lug nut tightness (proper torque is 79~94 lbf·ft [11~13 kgf·m]).