Kia Optima: Heater / Temperature Control Actuator

Kia Optima DL3 2019-2021 Service and Repair Manual / Heating, Ventilation and Air Conditioning / Heater / Temperature Control Actuator

Components and components location
Components Location

1. Temperature control actuator [LH]
2. Temperature control actuator [RH]

Description and operation
Description

The temperature control actuator is located at the heater unit. It regulates the temperature by the procedure as follows.

The signal from the control unit adjusts the position of the temperature door by operating the temperature switch. Then the temperature will be regulated by the hot/cold air ratio decided by the position of the temperature door.

Repair procedures
Inspection
1.

Turn the ignition switch OFF.

2.

Disconnect the temperature control actuator connector.

3.

Verify that the temperature control actuator operates to the cool position when connecting 12V to terminal 3 and grounding terminal 7.

Verify that the temperature control actuator operates to the warm position when connected in reverse.

[Driver's side temperature control actuator]

1. -
2. -
3. Cool position
4. Sensor power (+ 5V)
5. Feedback signal
6. Sensor ground
7. Warm position

[Passenger's side temperature control actuator]

1. -
2. -
3. Cool position
4. Sensor ground
5. Feedback signal
6. Sensor power (+ 5V)
7. Warm position

4.

Connect the temperature control actuator connector.

5.

Turn the ignition switch ON.

6.

Check the voltage between terminal 5 and 6.

  

It will feedback the current position of the actuator to controls.

Specification

Door Position
Voltage (V)
Error Detecting
Max. cooling
0.5 ± 0.15
Low voltage : 0.1V or less
High voltage : 4.9V or more
Max. heating
4.5 ± 0.15

7.

If the measured voltage is not within specification, check the operation by replacing the existing temperature control actuator with a new genuine part. After that, determine whether replacement of the temperature control actuator is required or not.

Replacement

[Driver]

1.

Disconnect the negative (-) battery terminal.

2.

Remove the crash pad lower panel.

(Refer to Body - "Crash Pad Lower Panel")

3.

Loosen the mounting screws and remove the shower duct [LH] (A).

4.

Separate the connector (A), loosen the mounting screws and remove the temperature control actuator (B).

5.

To install, reverse the removal procedure.

[Passenger]

1.

Disconnect the negative (-) battery terminal.

2.

Remove the crash pad center panel.

(Refer to Body - "Crash Pad Center Panel")

3.

Loosen the mounting screws and remove the shower duct [RH] (A).

4.

Separate the connector (A), loosen the mounting screws and remove the temperature control actuator (B).

5.

To install, reverse the removal procedure.

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