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Home >> Hyundai >> 2018 >> Kona Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 149 (Engine Control System Diagnosis - 2.0L (1 Of 3)) >> DTC P0128-00: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) >> Component Inspection >> Thermostat Inspection

Thermostat Inspection

WARNING: This page is about a different car, the 2021 Hyundai Kona. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check if the thermostat bypass valve is stuck in the open position or if the correct type of thermostat was installed. Replace thermostat as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  2. Check the valve opening temperature of the thermostat.

    Specification: 

    Thermostat Specification
    Valve Opening Temperature 100 ± 2° (212 ± 35.6°F)
    Valve Closing Temperature 90° (194°F)
    Full Lift More than 8mm (115°/239°F)
  3. If the opening temperature is not as specified, Replace thermostat as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure. If it is okay, go to next step below.
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