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Diagnosis Procedure

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
  1. Use a tempilstick in order to find the opening and the closing temperatures of the thermostat.
    • J 24731  188 tempilstick melts at 87°C (188°F). See Special Tools . The thermostat should begin to open at 90°C (194°F).
    • J 24731  206 tempilstick melts at 97°C (206°F). See Special Tools . The thermostat should be fully open at 107°C (225°F).
  2. Replace the thermostat if it does not operate properly between this temperature range.
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