At what temperature does the thermostat valve open?

The valve opening temperature is 88°C (190°F), with a maximum valve lift of 8 mm at 100°C (0.31 in at 212°F).

When should the electric cooling fan's water temperature switch turn on?

The switch should go from OFF to ON at 90°C (194°F).

How do I verify the thermostat closes correctly?

Check that the valve closes at 5°C (9°F) below its opening temperature, and after installation run the engine for a few minutes and check for leaks. The gasket should always be replaced.

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1990 Nissan Micra Thermostat & Electric Cooling Fan Inspection - Wiring Diagram

Engine cooling: thermostat inspection specs and electric cooling fan switch wiring diagram

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Engine cooling system page: thermostat valve opening 88C (190F) and lift 8/100, water-temp switch ON at 90C (194F), fan switch torque 9.3-10.3 Nm, fan wiring diagram.

AI caption April 2005 · Photo 98 of 412

This is page LC-8 of a factory engine cooling system service section, covering thermostat and electric cooling fan inspection. The thermostat portion shows an exploded diagram of the water outlet, thermostat, and gasket (which must always be replaced), with housing bolt torque of 5-8 N·m (0.5-0.8 kg-m, 3.6-5.8 ft-lb). Inspection steps include checking valve seating at ordinary temperature, verifying valve opening temperature of 88°C (190°F), maximum valve lift of 8 mm at 100°C (0.31 in at 212°F), and confirming the valve closes at 5°C (9°F) below opening temperature; after installation, run the engine briefly and check for leaks. The electric cooling fan portion covers testing the water temperature switch with an ohmmeter in heated water: it should switch from OFF to ON at 90°C (194°F). The switch installation torque is 9.3-10.3 N·m (0.95-1.05 kg-m, 6.9-7.6 ft-lb). A simplified wiring diagram shows current flow from the ignition switch (ON or START) through a 20A fuse to the fan motor and water temperature switch, with wire colors G/B, B, BR, and G indicated. Illustration reference codes SLC458, SLC343, and partial SLC46x/SLC79x are visible.

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Frequently asked questions

At what temperature does the thermostat valve open?: The valve opening temperature is 88°C (190°F), with a maximum valve lift of 8 mm at 100°C (0.31 in at 212°F).
When should the electric cooling fan's water temperature switch turn on?: The switch should go from OFF to ON at 90°C (194°F).
What is the torque spec for the thermostat housing bolts?: 5-8 N·m (0.5-0.8 kg-m, 3.6-5.8 ft-lb).
What is the torque for the water temperature switch?: 9.3-10.3 N·m (0.95-1.05 kg-m, 6.9-7.6 ft-lb).
How do I verify the thermostat closes correctly?: Check that the valve closes at 5°C (9°F) below its opening temperature, and after installation run the engine for a few minutes and check for leaks. The gasket should always be replaced.