Kia Optima: Heater / Heater Unit

Kia Optima DL3 2019-2024 Service and Repair Manual / Heating, Ventilation and Air Conditioning / Heater / Heater Unit

Components and components location

Component Location

1. Heater unit assembly

Compoents

1. Mode control actuator
2. Temperature control actuator [LH]
3. PTC Heater dummy
4. Shower duct [LH]
5. Heater core assembly
6. Evaporator temperature sensor

7. Evaporator core
8. Inhale hose
9. Shower duct [RH]
10. Temperature control actuator [RH]
11. Auto defogging actuator
12. Drain hose

Repair procedures

Replacement

•	When prying with a flat-tip screwdriver or use a prying trim tool, wrap it with protective tape, and apply protective tape around the related parts, to prevent damage.

1.	Disconnect the negative (-) battery terminal.

2.	Recover the refrigerant with a recovery/recycling/charging station.

3.	When the engine is cool, drain the engine coolant from the radiator. G 2.0 NU MPI (Refer to Engine Mechanical System - "Coolant") G 2.5 GDI THETA II (Refer to Engine Mechanical System - "Coolant")

4.	Remove the cowl top cover. (Refer to Body - "Cowl Top Cover")

Loosen the mounting nut and remove the expension valve cover (A).

Tightening torque :

8.8 - 13.7 N.m (0.9 - 1.4 kgf.m , 6.5 - 10.1 lb-ft)

Loosen the mounting bolts and separate the expension valve (A) from the evaporator core.

Tightening torque :

8.8 - 13.7 N.m (0.9 - 1.4 kgf.m , 6.5 - 10.1 lb-ft)

•	Plug or cap the lines immediately after disconnecting them to avoid moisture and dust contamination.

•	When installing, replace with a new O-ring.

Separate the heater hose (A) and (B).

•	Engine coolant will run out when the hoses are disconnected; drain it into a clean drip pan. Be sure not to let coolant spill on electrical parts or painted surfaces. If any coolant spills, rinse it off immediately.

8.	Loosen the cowl cross bar mounting bolts.

9.	Remove the front seat assembly. (Refer to Body - "Front Seat Assembly")

10.	Remove the floor console assembly. (Refer to Body - "Floor Console Assembly")

11.	Remove the crash pad center panel. (Refer to Body - "Crash Pad Ceter Panel")

12.	Remove the front pillar trim. (Refer to Body - "Front Pillar Trim")

13.	Remove the cowl side trim. (Refer to Body - "Cowl Side Trim")

14.	Remove the steering column shroud lower panel. (Refer to Body - "Steering Column Shroud Panel")

15.	Remove the steering wheel. (Refer to Steering System - "Steering Wheel")

16.	Remove the multifunction switch. (Refer to Body Electrical System - "Multifunction Switch")

17.	Lower the steering column after loosening the mounting bolts. (Refer to Steering System - "Steering Column and Shaft")

18.	Remove the accelerator pedal. (Refer to Engine Control/Fuel System - "Accelerator Pedal")

19.	Separate the floor carpet (A) to obtain space for removing the rear heating duct.

20.	Remove the rear heating duct (A).

21.	Separate the airbag control module (SRSCM) connector (A).

22.	Loosen the front pillar mounting clips and separate the connectors (A). [LH] [RH]

23.	Separate the junction box connectors (A).

24.	Separate the multi box connectors (A). [LH] [RH]

25.	Remove the drain hose (A).

26.

Remove the lower mounting bolt of the blower unit.

Tightening torque :

3.9 - 5.9 N.m (0.4 - 0.6 kgf.m , 2.9 - 4.3 lb-ft)

[LH]

[RH]

27.	Remove the plug holes (A).

28.	Loosen the cowl cross bar side mounting bolts. [LH] [RH]

29.	After loosening the bolts and nuts remove the crash pad and heater & blower unit assembly (A) together.

30.	Remove the integrated body control unit. (Refer to Body Electrical System - "Integrated Body Control Unit (IBU)")

31.	Remove the heater control unit. (Refer to Heating,Ventilation And Air Conditioning - "Heater Control Unit")

32.

Separate the heater & blower unit connectors and wiring.

[LH]

(1)	Separate the temperature control actuator [LH] (A) and mode control actuator (B) connectors.

[RH]

(1)	Separate the auto defogging actuator connector (A).

(2)	Separate the intake actuator (A), cluster ionizer (B) and temperature control actuator [RH] (C) connectors.

(3)	Separate the evaporator sensor (a) and power mosfet (B) connectors.

(4)	Separate the blower motor connector (A).

33.	Loosen the mounting nuts, bolts and remove the heater & blower unit (A) from the crash pad.

34.	Loosen the mounting screws, separate the heater unit (A) and blower unit (B).

35.

To install, reverse the removal procedure.

•	Make sure connectors are connected properly.

Heater Core

Repair procedures Replacement 1. Disconnect the negative (-) battery terminal. 2. Remove the heater and blower assembly. (Refer to Heater - " ...

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