Hyundai Elantra: 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.

   
If the ambient temperature is below 1.0°C (33.8°F), the A/C compressor will stop.
The compressor will operate manually.
Photo Sensor Repair procedures
Inspection 1. Turn the ignition switch ON. 2. Connect the GDS. 3. Emit intensive light toward the photo sensor using a lamp, and check the output voltage change. 4. The voltage will ri ...

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 ...

Other information:

Hyundai Elantra AD (2016-2020) Owners Manual: Windshield Defrosting and Defogging
WARNING Windshield heating Do not use the or position during cooling operation in extremely humid weather. The difference between the temperature of the outside air and that of the windshield could cause the outer surface of the windshield to fog up, causing loss of visibility could cause ...

Hyundai Elantra AD (2016-2020) Service Manual: Variable Intake Solenoid (VIS) Valve Description and Operation
Description Variable Intake manifold Solenoid (VIS) valve is installed on the intake manifold. The VIS valve controls the vacuum modulator which activates a valve in the intake manifold. The ECM opens or closes this valve according to engine condition (Refer to below table). Engine cond ...

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