Civic L4-1668cc 1.7L SOHC MFI (2003)
Thermostat: Testing and Inspection
Test
Replace the thermostat if it is open at room temperature.
To test a closed thermostat:
1. Suspend the thermostat (A) in a container of water. Do not let the thermometer (B) touch the bottom of the hot container.
2. Heat the water and check the temperature with a thermometer. Check the temperature at which the thermostat first opens, and at which it is fully
open.
3. Measure the lift height of the thermostat when it is fully open:
Standard Thermostat
Lift height: above 8.0 mm (0.31 inch)
Starts opening: 169 - 176°F (76 - 80°C)
Fully open: 194°F (90°C)