Hyundai Elantra: Air Conditioning System / Evaporator Temperature Sensor
Description and operation
The evaporator temperature sensor will detect the evaporator core temperature and interrupt compressor relay power in order to prevent evaporator from freezing by excessive cooling. The evaporator temperature sensor has the Negative Temperature Coefficient (NTC). Electrical resistivity of NTC will increase with decreasing temperature and decrease with increasing temperature.

Repair procedures
1. | Turn the ignition switch ON. |
2. | Turn the A/C switch ON. |
3. | Measure the resistance between terminal "+" and "-" of the evaporator temperature sensor.
Evaporator core temperature
| Resistance [KΩ]
| Voltage [V]
| [°C (°F)]
| -10 (14)
| 43.35
| 2.96
| 0 (32)
| 27.62
| 2.4
| 10 (50)
| 18.07
| 1.88
| 20 (68)
| 12.11
| 1.44
| 30 (86)
| 8.3
| 1.08
| 40 (104)
| 5.81
| 0.81
|

|
1. | Disconnect the negative (-) battery terminal. |
2. | Remove the evaporator core. (Refer to Heater - "Evaporator Core") |
3. | Remove the evaporator temperature sensor (A) front evaporator core. 
|
4. | To install, reverse the removal procedure. |
Description and operation
DescriptionThe A/C Pressure Transducer (APT) converts the pressure value of high pressure line into voltage value after measuring it...
Description and operation
DescriptionThe In-car air temperature sensor is built in the heater & A/C control unit.The sensor contains a thermistor which measures the temperature of the inside...
Other information:
(1) Stop lamp
(2) Tail lamp (LED or bulb)
(3) Turn signal lamp
(4) Reverse lamp
(5) Rear side marker (LED or bulb)
Tail/Stop lamp/Turn signal lamp/
Side marker (Outer lamp) (Bulb type)
1. Open the trunk lid.
2. Remove the service cover by pulling
out the service cover...
Check the condition and connections
of all cooling system hoses and
heater hoses. Replace any swollen or
deteriorated hoses.
The coolant level should be filled
between the F and the L marks on the
side of the coolant reservoir when the
engine is cool...