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Home >> Kia >> 2008 >> Rio Base, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> DTC Troubleshooting Procedures (1 Of 2) >> DTC P0128 Coolant Thermostat (Coolant Temp. Below Thermostat Regulating Temp.) >> Component Inspection

Component Inspection

  1. Check Thermostat.
    1. Check cooling system coolant level and fill if low.
    2. Check for a proper cooling system operation. Especially check that cooling and condenser fan operates normally.
    3. Remove the thermostat and check the following items:
      1. Stuck or damaged
      2. Verify the temperature at which the valve is open

        : 80-84°C (176-183.2°F)

    4. Has a problem been found?

      YES 

      • Substitute with a known-good Thermostat and check for proper operation. If the problem is corrected, replace Thermostat and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

      NO 

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