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Home >> Suzuki >> 2008 >> XL7 Base, FWD >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling System >> Diagnostic Information and Procedures >> Thermostat Diagnosis

Thermostat Diagnosis

Special Tool 

J 24731 188 Tempilstick 

J 24731 206 Tempilstick 

The coolant thermostat can be tested using a temperature (tempil) stick. The temperature stick is a pencil-like device which has a wax material containing certain chemicals that 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 outlet coolant pipe.

  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). The thermostat should begin to open at 90 °C (194 °F).
    • J 24731 206 tempilstick melts at 97 °C (206 °F). 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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