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Home >> Kia >> 2016 >> Optima SX Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 95 (Engine Control System Diagnosis - 1.6L (1 Of 3) - Optima (Except HEV)) >> DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) >> Component Inspection

Component Inspection

WARNING: This page is about a different variant/trim than selected.

■ Engine Coolant Inspection 

  1. Check the engine coolant level.
  2. Is the engine coolant in the reservoir at the proper level?

    YES 

    • Go to "Thermostat Inspection" procedure below.

    NO 

■ Thermostat Inspection 

  1. Check if the thermostat bypass valve is stuck in the open position or if the correct type of thermostat was installed.
  2. Check the valve opening temperature of the thermostat

    Specification:  Valve Opening Temperature: 80-84°C (176-183°F)

  3. Is the thermostat in normal condition?

    YES 

    NO 

    • Carefully re-do this troubleshooting guide steps.
    • If problem still occurs, replace Thermostat and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.