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Home >> Pontiac >> 2009 >> Vibe Base, 2.4 0, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 113 (Engine Cooling System) >> Diagnostic Information and Procedures >> Thermostat Diagnosis >> Thermostat Test

Thermostat Test

WARNING: This page is about a different car, the 2011 Cadillac DTS. 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. Refer to Engine Coolant Thermostat Replacement .
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