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Home >> Kia >> 2016 >> Optima SX Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 43 (Engine Cooling System (HEV)) >> Radiator (Engine) >> Repair Procedures >> Removal and Installation

Removal and Installation

WARNING: This page is about a different variant/trim than selected.
  1. Disconnect the battery negative terminals. (Refer to Auxiliary 12V Battery .)
  2. Remove the air cleaner assembly. (Refer to Engine And Transaxle Assembly .)
  3. Disconnect the fan motor connector (A).
  4. Remove the radiator upper hose clip (B).
    Fig 1: Locating Fan Motor Connector & Radiator Upper Hose Clip
    G11815431Courtesy of KIA MOTORS AMERICA, INC.
  5. Remove the EWP(Electric water pump) inlet pipe mounting bolts (A).
    Fig 2: Removing Electric Water Pump Inlet Pipe Mounting Bolts
    G11815432Courtesy of KIA MOTORS AMERICA, INC.
  6. Remove the cooling fan assembly (A).

    Tightening torque: 

    4.9 ~ 7.8 N.m (0.5 ~ 0.8 kgf.m, 3.6 ~ 5.8 lb-ft)

    Fig 3: Removing Cooling Fan Assembly
    G11815433Courtesy of KIA MOTORS AMERICA, INC.
  7. Remove the under cover. (Refer to Engine And Transaxle Assembly . )
  8. Loosen the drain plug (A), and drain the engine coolant. Remove the radiator cap to help drain the coolant faster.
    Fig 4: Loosening Drain Plug
    G11815434Courtesy of KIA MOTORS AMERICA, INC.
  9. Disconnect the over flow hose (A) from the radiator.
    Fig 5: Disconnecting Flow Hose From Radiator
    G11815435Courtesy of KIA MOTORS AMERICA, INC.
  10. Disconnect the radiator upper hose (A) and lower hose (B).
    Fig 6: Disconnecting Radiator Upper Hose (A) And Lower Hose (B)
    G11815436Courtesy of KIA MOTORS AMERICA, INC.
  11. Remove the radiator mounting brackets (A).

    Tightening torque: 

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

    Fig 7: Removing Radiator Mounting Brackets
    G11815437Courtesy of KIA MOTORS AMERICA, INC.
  12. Drain the inverter coolant and then disconnect the inverter radiator hoses. (Refer to Coolant .)
  13. Separate the condenser from the radiator and then remove the radiator assembly (A).
    Fig 8: Removing Radiator Assembly
    G11815438Courtesy of KIA MOTORS AMERICA, INC.
  14. Disassemble the inverter radiator (A) from the radiator assembly (B). (Refer to "Radiator ".)
    Fig 9: Disconnecting Inverter Radiator From Radiator Assembly
    G11815439Courtesy of KIA MOTORS AMERICA, INC.
  15. Installation is the reverse order of removal.
  16. Fill the radiator with coolant and check for leaks.
    NOTE:
    • Bleed air from the hybrid motor cooling system prior to the engine cooling system (Refer to Coolant . )
    • Bleed air from the engine cooling system.
      • Start engine and let it run until it warms up. (Until the radiator fan operates 3 or 4 times.)
      • Turn off engine. Check the coolant level and add coolant if needed. This will allow trapped air to be removed from the cooling system.
      • Put the radiator cap on tightly, then run engine again and check for leaks.