Circuit operation

CIRCUIT OPERATION

After the fluid has cooled the engine, it comes out of the cylinder head through the intake bodies and reaches the thermostat unit through special hoses.

From here, if the temperature is below 86° ± 2°C it is taken in by the pump through the inlet union.

If the temperature is higher than this value, the thermostat opens and the fluid is sent to the radiator. After being cooled in the radiator, the fluid returns through a pipe to the inlet union and from this to the pump which ducts it back to the radiator.

A connection pipe is fitted on the radiator for coupling with the header tank.

A pipe leading from the thermostatic cup takes the coolant fluid to the passenger compartment heater and, for the 16V versions, it branches with a return pipe to the header tank which also serves to bleed the air from the system.

For the 8V versions, a branch from the heater delivery pipe goes to heat the throttle valve from where it returns directly to the header tank.

A pipe leading from the heater joins the supply pipe leading from the header tank and goes to the pump inlet.

1. Water pump
2. Thermostatic cup
3. Cooling solenoid valve
4. Radiator
5. Fan control thermal contact
6. Heater radiator
7. Expansion tank
8. Inlet manifolds
9. Max. coolant temperature warning light transmitter
10. Coolant temperature indicator transmitter
11. Pump coolant filter inlet
12. Additional resistance for fan speeds