Header tank

1. Drain the engine coolant fluid, disconnecting the radiator outlet sleeve.

NOTE: Collect the engine coolant fluid in a suitable container.

WARNING: The antifreeze fluid used as engine coolant is harmful to paint. Therefore, avoid any contact with painted parts.

• Re-connect the sleeve to the radiator and any disconnected pipes, checking that all the clamps are tightened.
• Fill with fluid of the type and quantity specified until reaching the MAX mark on the header tank.
• Start the engine and bring it to normal operating temperature so that the thermostat opens to release the air left in the circuit.
• When the engine is cold, top up to the MAX mark on the header tank.
• Screw the pressurised cap back on the header tank.

WARNING: Antifreeze fluids of different types or brands should not be mixed. Do not use antirust additives: they might be incompatible with the antifreeze used.

HEADER TANK

The header tank supplies the circuit and absorbs the changes in volume of the coolant fluid with the changing temperature of the engine. The tank also allows air out of the circuit, through a special calibrated valve in the pressurised cap and a pipe connected to it. This valve also carries out a washing action admitting air from outside when there is a vacuum - in the circuit caused by cooling of the engine.

REMOVAL/REFITTING

• Drain the engine coolant fluid (see specific paragraph).

1. Loosen the clamps and disconnect the coolant fluid inlet and outlet pipes from the header tank.
2. Slacken the fastening screws and remove the header tank.