- drain the coolant by unscrewing the drain plug of the cylinder block;
- loosen the clamp and remove the hose from the thermostat cover;
Fig. 3.88. Thermostat housing
- unscrew the bolts securing the thermostat cover and remove it (Fig. 3.88);
Fig. 3.89. Removing the thermostat and sealing ring
- remove the sealing ring and take the thermostat out of the housing (Fig. 3.89).
To check, place the thermostat in a container with water. Heat the water, monitoring the temperature with a thermometer. Visually note the opening of the thermostat valve when the water boils and closing when it cools to 89°C. If the valve does not work in any of the positions, the thermostat must be replaced.
The thermostat is installed in the reverse order of removal, replacing the sealing ring. Start the engine and make sure there is no coolant leak.
(The text is available on this website: RenaultBook)