Engine Fails To Reach Normal Operating Temperature
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Engine Fails To Reach Normal Operating Temperature
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Special Tools
J 24731
Tempil Stick
For equivalent regional tools, refer to
Special Tools
Use one of the following procedures in testing for a malfunctioning thermostat.
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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. Take a 87°C (188°F) tempil stick or a 97°C (206°F) tempil stick and rub it on the thermostat housing. Temperature sticks can be used to determine a thermostat's operating range.
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1.
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Use a
J 24731
Tempil Stick in order to find the opening and the closing temperatures of the coolant thermostat.
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The 188 tempil stick melts at 87°C (188°F). The thermostat should begin to open.
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The 206 tempil stick melts at 97°C (206°F). The thermostat should be fully open.
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2.
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Replace the coolant thermostat if it does not operate properly between this temperature range.
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Thermostat Test Procedure Using Glycol
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Inspect the operation of the thermostat by hanging the thermostat on a hook in a 50/50 percent solution of DEX-COOL® and clean drinkable water.
In order to inspect if the thermostat valve is opening properly, perform the following test:
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1.
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Completely submerge the thermostat in the glycol solution. The solution should be 11°C (22°F) above the temperature indicated on the thermostat valve.
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Thoroughly agitate the solution. Under these conditions, the thermostat valve should open.
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In order to inspect if the thermostat valve is closing properly, perform the following test:
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Completely submerge the thermostat in a glycol solution. The solution should be 6°C (10°F) below the temperature indicated on the thermostat valve.
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Thoroughly agitate the solution. Under these conditions, the thermostat valve should close completely.
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