Thermostat unit

THERMOSTAT UNIT

The thermostat unit is fitted on the upper side of the crankcase.

Its purpose is to ensure that the engine does not exceed the optimum temperature: until the coolant temperature reaches 86° ± 2°C, the thermostat valve diverts the fluid directly towards the pump; at higher temperatures the thermostat valve opening allows the fluid to flow towards the radiator.

1. Return from bodies
2. Delivery to heater
3. Delivery to pump
4. Delivery to radiator

Total bulb stroke (at 100°C)
≥ 7 mm

REMOVAL/REFITTING

• Set the car on a lift and raise it.

1. Unscrew the two plugs under the crankcase and drain the coolant into a suitable recipient.

WARNING:

The anti-freeze mixture used as coolant can damage the paintwork: avoid touching any painted parts with it.

• Remove the intake box (see GROUP 10).

1. Disconnect the coolant return sleeves from the thermostatic cup.
2. Disconnect the coolant delivery sleeve to the heater from the thermostatic cup.
3. Disconnect the coolant delivery sleeve to the pump inlet from the thermostatic cup.
4. Disconnect the coolant delivery sleeve to the radiator from the thermostatic cup.
5. Slacken the fastening screw and remove the thermostatic cup.

CHECKS AND INSPECTIONS

Check that the thermostat setting is within the specified limits.

• If the setting is incorrect, change the thermostat.

RADIATOR

The radiator is sized to dissipate the heat produced during operation of the engine.

It comprises a radiator core (front radiating surface 20.3 dm²) and two side tanks fitted with unions for the inlet and outlet of the coolant fluid; the radiator core pipes and fins are in aluminium and the tanks are in plastic.