LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling System >> Diagnostic Information and Procedures >> Thermostat Diagnosis >> Thermostat Test Procedure Using Tempil Sticks

Thermostat Test Procedure Using Tempil Sticks

The coolant thermostat can be tested using a temperature, or tempil stick. The tempil stick is a pencil-like device. The tempil stick 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 J 24731  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 the thermostat does not operate properly between this temperature range.
scientia non olet · About LEMON Manuals