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Thermostat Test Procedure Using Tempil Sticks

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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 tempil stick in order to find the opening and the closing temperatures of the coolant thermostat.
    • J 24731  -188 tempil stick melts at 87° C (188° F). The thermostat should begin to open.
    • J 24731  -206 tempil stick 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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