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

Removal and Installation

WARNING: This page is about a different variant/trim than selected.
NOTE: Disassembly of the thermostat would have an adverse effect, causing a lowering of cooling efficiency. Do not remove the thermostat, even if the engine tends to overheat.
  1. Drain engine coolant so its level is below thermostat.
  2. Disconnect the radiator lower hose (A).
    Fig 1: Disconnecting Radiator Lower Hose
    G11815447Courtesy of KIA MOTORS AMERICA, INC.
  3. Remove water inlet fitting (C), gasket (B) and thermostat (A).

    Tightening torque: 

    7.8 ~ 11.8N.m (0.8 ~ 1.2kgf.m, 5.8 ~ 8.7lb-ft)

    Fig 2: Removing Water Inlet Fitting, Gasket And Thermostat
    G11815448Courtesy of KIA MOTORS AMERICA, INC.
  4. Installation is reverse order of removal.
    NOTE:
    • Install the thermostat with the jiggle valve upward.
    • When assembling the thermostat, place the thermostat on the housing with a protrusion of thermostat matching with a groove of the housing and install the gasket and inlet fitting. Be careful the thermostat doesn't get out of the groove on the housing.
    1. Fill the engine coolant.
    2. Start the engine and check for leaks.
    3. Recheck the coolant level.