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Home >> Chevrolet >> 2018 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 23 (Engine Cooling System) >> Diagnostic Information and Procedures >> Thermostat Diagnosis

Thermostat Diagnosis

WARNING: This page is about a different car, the 2017 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the thermostat from the vehicle. Refer to Engine Coolant Thermostat Housing Replacement (L5Q) Engine Coolant Thermostat Housing Replacement (LV7) .
  2. Make sure the valve spring is tight when the thermostat is fully closed. If the spring is not tight, replace the thermostat.
  3. Suspend the thermostat and a thermometer in a pan containing a 50/50 mixture of ethylene glycol and water. Do not let the thermostat or the thermometer rest on the bottom of the pan because the uneven concentration of heat on the bottom could result in inaccurate temperature measurements.
  4. Heat the pan on a burner.
  5. Use the thermometer to measure the temperature of the heated solution.
  6. The thermostat should begin to open at 105°C (221°F) and it should be fully open at 120°C (248°F) and it should be fully close at 98° C (208.4° F). If it does not open or close at these temperature, replace the thermostat. Also, the thermostat rod's stroke from the initially open to the fully open should be 8 mm (0.32 in).
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