GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2009 🢒 Vibe - FWD 🢒 Engine 🢒 Engine Cooling 🢒 Thermostat Diagnosis

    Object Number: 2015721 Size: SH
  1. Inspect the thermostat.
  2. The valve opening temperature is inscribed on the thermostat.

    3. Object Number: 2015722 Size: SH
  3. Immerse the thermostat in water, and then gradually heat the water.
  4. Inspect the standard valve opening temperature of the thermostat.

    5. Standard Valve Opening Temperature: 80 to 84°C (176 to 183°F)

    If the valve opening temperature is not as specified, replace the thermostat.


    Object Number: 2015724 Size: SH
  5. Inspect the standard valve lift (a) is 10 mm (0.394 in) or more at 95°C (203°F).

    6. If the valve lift is not as specified, replace the thermostat.

  6. Inspect that the valve is fully closed when the thermostat is at low temperatures, below 77°C (171°F).

    7. If it is not fully closed, replace the thermostat.