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Thermostat Test Procedure Using Tempilsticks

WARNING: This page is about a different car, the 2003 Pontiac Montana, 2003 Oldsmobile Silhouette, and 2003 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.

Tools Required 

J 24731  Tempilstick

The coolant thermostat can Be tested using a temperature (tempil) stick. The temperature stick is a pencil like device. It has a wax material containing certain chemicals which melt at a given temperature. Temperature sticks can Be used to determine a thermostat's operating range, By rubbing 87°C (188°F) and 97°C (206°F) sticks on the thermostat housing.

  1. Use a tempilstick in order to find the opening and the closing temperatures of the coolant thermostat.
    • J 24731 - 188 tempilstick melts at 87°C (188°F). The thermostat should Begin to open.
    • J 24731-206 tempilstick melts at 97°C (206°F). The thermostat should Be fully open.
  2. Replace the coolant thermostat if it does not operate properly Between this temperature range.
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