Kia Optima: Air Conditioning System / Evaporator Temperature Sensor

Kia Optima DL3 2019-2022 Service and Repair Manual / Heating, Ventilation and Air Conditioning / Air Conditioning System / Evaporator Temperature Sensor

Description and operation

Description

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

Inspection

1.	Turn the ignition switch OFF.

2.	Disconnect the evaporator temperature sensor connector.

Measure the resistance between terminal "+" and "-" of the evaporator temperature sensor.

Specification

Evaporator core temperature [°C (°F)]	Resistance [KΩ]	Voltage [V]
-10 (14)	43.35	2.96
0 (32)	27.62	2.40
10 (50)	18.07	1.88
20 (68)	12.11	1.44
30 (86)	8.30	1.08
40 (104)	5.81	0.81

1. Sensor Ground

2. Evaporator sensor (+)

Replacement

1.	Disconnect the negative (-) battery terminal.

2.	Remove the evaporator core assembly. (Refer to Heater - "Evaporator Core")

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

4.	To install, reverse the removal procedure.

A/C Pressure Transducer

Description and operation Description The A/C Pressure Transducer (APT) converts the pressure value of high pressure line into voltage value after measuring it. By converted voltage va ...

In-car Sensor

Description and operation Description The In-car air temperature sensor is built in the heater & A/C control unit. The sensor contains a thermistor which measures the temperature ...

Other information:

Kia Optima DL3 2019-2022 Service and Repair Manual: Ignition System

Description and operation Description Ignition timing is controlled by the electronic control ignition timing system. The standard reference ignition timing data for the engine operating conditions are pre-pro grammed in the memory of the ECM (Engine Control Module). The engine ...

Kia Optima DL3 2019-2022 Service and Repair Manual: Start/Stop Button

Schematic diagrams Connector and Terminal function Repair procedures Removal 1. Disconnect the negative battery terminal. 2. Remove the crash pad garnish [RH]. (Refer to Body - "Crash Pad Garnish") 3 ...