Kia Optima: Cooling System / Water Temperature Control Assembly

Kia Optima DL3 2019-2025 Service and Repair Manual / Engine Mechanical System / Cooling System / Water Temperature Control Assembly

Components and components location

Components

1. Water temperature control assembly
2. Engine coolant temperature sensor

3. Throttle body coolant hose

Repair procedures

Removal and Installation

1.	Remove the engine cover. (Refer to Engine and Transaxle Assembly - "Engine Cover")

2.	Drain the engine coolant. (Refer to Cooling System - "Coolant")

3.	Remove the air cleaner assembly. (Refer to Intake and Exhaust System - “Air Cleaner”)

4.	Disconnect the radiator upper hose (A).

5.	Disconnect the heater hoses (A).

6.	Disconnect the bypass hose (A).

Remove the water temperature control assembly (A) with the O-ring (B).

Tightening torque:

9.8 - 11.8 N•m (1.0 - 1.2 kgf•m, 7.2 - 8.7 lb•ft)

•	Install a new O-ring.

•	Clean surface on the O-ring and install the O-ring after wetting with water.

8.	Install in the reverse order of removal.

9.	Fill the engine coolant. (Refer to Cooling System - "Coolant")

10.	Start engine and check for leaks.

Radiator

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Water pump

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