Tools Required
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.
- 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). |
- Replace the thermostat if it does not operate properly between this temperature
range.
