Civic DX Coupe L4-1590cc 1.6L SOHC MFI (1999)
Thermostat: Testing and Inspection
Note: Replace the thermostat if it is open at room temperature.
Procedure to test a closed thermostat:
1. Suspend the thermostat in a container of water as shown.
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.
CAUTION: Do not let the thermometer touch the bottom of the hot container.
3. Measure lift height of the thermostat when 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)
