Evaporator Temperature Sensor

Description and Operation

Description

The evaporator temperature sensor detects the temperature of the evaporator core and turns off the compressor relay to prevent the evaporator from freezing due to excessive cooling.

Repair Procedures

Inspection

1. 1
   Turn the ignition off.
2. 2
   Disconnect the evaporator temperature sensor connector.
3. 3
   Measure the resistance between the "+" and "-" terminals of the evaporator temperature sensor.

   

   Specification

   Evaporator Core Temperature [°C (°F)]	Resistance [kΩ]	Voltage [V]
   -10 (14)	17,93	3.21
   0 (32)	11.36	2,66
   10 (50)	7.4	2.13
   20 (68)	4,94	1,66
   30 (86)	3,37	1,26
   40 (104)	2,35	0,95

4. 4
   Connect the evaporator temperature sensor connector.
5. 5
   Start the engine, turn on the air conditioner, then measure the voltage between the harness connector terminals.

Replacement

1. 1
   Disconnect the negative (-) battery terminal.
2. 2
   Loosen the mounting screws and remove the evaporator core cover (A).

   

3. 3
   Separate the evaporator temperature sensor (A) from the evaporator core.

   

4. 4
   Install in the reverse order of removal.