Thermostat, Engine Cooling

Thermostat Diagnosis
(Overheating)
Use a temperature stick to determine a thermostats operating temperature by rubbing 87°C (188°F) and 97°C (206°F) sticks on coolant outlet. The marks made by the sticks should melt when coolant temperatures reach 87°C (188°F) and 97°C (206°F), respectively. These temperature are the normal operating range of the thermostat.

(Slow to Heat)
Use a temperature stick to determine a thermostats operating temperature by rubbing 87°C (188°F) and 97°C (206°F) sticks on coolant outlet. The marks made by the sticks should melt when coolant temperatures reach 87°C (188°F) and 97°C (206°F), respectively. These temperature are the normal operating range of the thermostat.