INTRODUCTION

3.0 24V V6

DESCRIPTION

The cooling circuit is forced circulation type via a centrifugal pump.

The circuit is sealed and consists of the following parts:

- radiant mass (engine cooling).

- supply reservoir.

- recirculation pump.

- thermostat.

- passenger compartment heating radiator.

- connecting pipes and hoses.

Engine coolant temperature control

There are three-speed fans to increase the heat dissipation capacity of the radiator.

The cooling fans are controlled directly by the engine management node which, depending on the temperature of the engine coolant:

- controls the cooling fans via the fan control interface;

- with the engine coolant temperature above the recommended limit, lights up the warning light in the instrument panel;

The maximum pressure for the engine cooling circuit is 1.4 bar at 118°C.

Composition

The engine cooling system comprises the components illustrated in the diagram below.

1. Radiator.

2. Water level sensor.

3. Pressurized cap.

4. Supply reservoir.

5. Engine oil/water heat exchanger.

6. Passenger compartment heating radiator.

7. Automatic transmission fluid/water heat exchanger.

8. Thermostat unit.

9. Radiator/thermostat bleed screw.

- Diagrammatic view of engine cooling system

1. Radiator.

2. Supply reservoir.

3. Pressurized cap.

4. Water level sensor.

5. Engine oil/water heat exchanger.

6. Passenger compartment heating radiator.

7. Automatic transmission fluid/water heat exchanger.

8. Thermostat unit.

9. Radiator/thermostat bleed screw.

Pipes and hoses

10. Supply to radiator.

11. Return from radiator.

12. Supply and return from engine oil/water heat exchanger

13. Return from expansion tank.

14. Supply to expansion tank.

15. Return from passenger compartment heating radiator.

16. Supply to passenger compartment heating radiator.

17. Return from automatic transmission fluid/water heat exchanger.

18. Supply to automatic transmission fluid/water heat exchanger.

2.0 16v, 3.0 24V V6

SUPPLY / EXPANSION TANK

In addition to supplying the circuit, the coolant reservoir absorbs the variations in the volume of the coolant as the temperature of the engine varies.

A special calibrated valve in the pressurised cap assures the following:

- emergence of air from the circuit collected by the pipe leading from thermostat.

· air intake when the circuit contains a vacuum (due to engine cooling).

RADIATOR

It consists of a radiant mass and two side tanks for the intake and outlet of coolant.

The radiator pipes and fins are aluminium, the tanks are plastic.

2.0 16V JTD, 2.2 16V JTD

SUPPLY / EXPANSION TANK

In addition to supplying the circuit, the coolant reservoir absorbs the variations in the volume of the coolant as the temperature of the engine varies.

A special calibrated valve in the pressurised cap assures the following:

- emergence of air from the circuit collected by the pipe leading from thermostat.

· air intake when the circuit contains a vacuum (due to engine cooling).

2.0 16v

RADIATOR

2.0 16V JTD, 2.2 16V JTD

It consists of a radiant mass and two side tanks for the intake and outlet of coolant.

The radiator pipes and fins are aluminium, the tanks are plastic.

3.0 24V V6

WATER PUMP

It is the centrifugal type with vanes secured to the crankcase and operated directly through the timing belt.

THERMOSTAT

Fitted to the rear of the cylinder head and performs the function of maintaining the engine at optimum temperature:

· with temperature < 82 ± 2°C the thermostat valve (closed) directs coolant directly toward the water pump.

· with the temperature > 82 ± 2°C the thermostatic valve starts to open until it is completely open at 95°C, directing the flow of coolant toward the radiator.

The engine coolant temperature sensor connected to the Engine Management Node is fitted on the thermostat casing.

2.0 16v

WATER PUMP

It is the centrifugal type with vanes secured to the crankcase and operated directly through the timing belt.

THERMOSTAT

Fitted to the rear of the cylinder head and performs the function of maintaining the engine at optimum temperature:

· with temperature < 89 ± 2°C the thermostat valve (closed) directs coolant directly toward the water pump.

· with the temperature > 89 ± 2°C the thermostatic valve starts to open until it is completely open at 101°C, directing the flow of coolant toward the radiator.

The engine coolant temperature sensor connected to the Engine Management Node is fitted on the thermostat casing.

2.0 16V JTD, 2.2 16V JTD

WATER PUMP

It is the centrifugal type with vanes secured to the crankcase and operated directly through the timing belt.

THERMOSTAT

Fitted to the rear of the cylinder head and performs the function of maintaining the engine at optimum temperature:

· with temperature < 83 ± 2°C the thermostat valve (closed) directs coolant directly toward the water pump.

· with the temperature > 83 ± 2°C the thermostatic valve starts to open until it is completely open at 95°C, directing the flow of coolant toward the radiator.

The engine coolant temperature sensor connected to the Engine Management Node is fitted on the thermostat casing.

3.0 24V V6

The three speed cooling fan increases the heat dissipation capacity of the radiator and the air conditioning system condenser if fitted.

It is controlled directly by the Engine Management Node in accordance with a specific operating logic.

2.0 16v

FAN

The three speed cooling fan increases the heat dissipation capacity of the radiator and the air conditioning system condenser if fitted.

It is controlled directly by the Engine Management Node in accordance with a specific operating logic.

DESCRIPTION

The cooling circuit is forced circulation type via a centrifugal pump.

The circuit is sealed and consists of the following parts:

- radiant mass (engine cooling).

- supply reservoir.

- recirculation pump.

- thermostat.

- passenger compartment heating radiator.

- connecting pipes and hoses.

Engine coolant temperature control

There are three-speed cooling fans to increase the heat dissipation capacity of the radiator.

The cooling fans are controlled directly by the engine management node which, depending on the temperature of the engine coolant:

- controls the cooling fans via the fan control interface;

- with the engine coolant temperature above the recommended level, lights up the warning light in the instrument panel;

The maximum pressure for the engine cooling circuit is 1.4 bar at 118°C.

Composition

- Versions with automatic transmission

The engine cooling system comprises the elements illustrated in the diagram below.

1. Radiator.

2. Supply reservoir/expansion tank.

3. Pressurized cap.

4. Engine oil/water heat exchanger.

5. Water pump.

6. Thermostat unit.

7. Automatic heating radiator.

8. Radiator bleed screw.

- Versions with automatic transmission

On versions with AL4 automatic transmission, the engine cooling system differs compared with versions with manual transmission through the presence of the elements illustrated below.

1. Water/oil heat exchanger (fitted on the automatic transmission).

2. Heat exchanger water inlet pipe.

3. Heat exchanger water outlet pipe.

2.0 16V JTD, 2.2 16V JTD

FAN

The three speed cooling fan increases the heat dissipation capacity of the radiator and the air conditioning system condenser if fitted.

It is controlled directly by the Engine Management Node in accordance with a specific operating logic.