All about Ford Mondeo

General information
Cooling, heating, and air conditioning systems / General information


Engine cooling system All vehicles covered by this manual employ a pressurised engine cooling system with thermostatically-controlled coolant circulation.

A water pump mounted on the drivebelt end of the cylinder block/crankcase pumps coolant through the engine. The coolant flows around each cylinder and toward the transmission end of the engine. Cast-in coolant passages direct coolant around the inlet and exhaust ports, near the spark plug areas and close to the exhaust valve guides.

A wax pellet type thermostat is located in a housing at the transmission end of the engine.

During warm-up, the closed thermostat prevents coolant from circulating through the radiator. Instead, it returns through the coolant metal pipe running across the front of the engine to the radiator bottom hose and the water pump. The supply to the heater is made from the rear of the thermostat housing.

As the engine nears normal operating temperature, the thermostat opens and allows hot coolant to travel through the radiator, where it is cooled before returning to the engine.

The cooling system is sealed by a pressuretype filler cap in the expansion tank. The pressure in the system raises the boiling point of the coolant, and increases the cooling efficiency of the radiator. When the engine is at normal operating temperature, the coolant expands, and the surplus is displaced into the expansion tank. When the system cools, the surplus coolant is automatically drawn back from the tank into the radiator.

Warning: DO NOT attempt to remove the expansion tank filler cap, or to disturb any part of the cooling system, while it or the engine is hot, as there is a very great risk of scalding. If the expansion tank filler cap must be removed before the engine and radiator have fully cooled down (even though this is not recommended) the pressure in the cooling system must first be released. Cover the cap with a thick layer of cloth, to avoid scalding, and slowly unscrew the filler cap until a hissing sound can be heard. When the hissing has stopped, showing that pressure is released, slowly unscrew the filler cap further until it can be removed; if more hissing sounds are heard, wait until they have stopped before unscrewing the cap completely. At all times, keep well away from the filler opening.

Warning: Do not allow antifreeze to come in contact with your skin, or with the painted surfaces of the vehicle. Rinse off spills immediately with plenty of water. Never leave antifreeze lying around in an open container, or in a puddle in the driveway or on the garage floor. Children and pets are attracted by its sweet smell, but antifreeze is fatal if ingested.

Warning: If the engine is hot, the electric cooling fan may start rotating even if the engine is not running, so be careful to keep hands, hair and loose clothing well clear when working in the engine compartment.

Heating system
The heating system consists of a blower fan and heater matrix (radiator) located in the heater unit, with hoses connecting the heater matrix to the engine cooling system. Hot engine coolant is circulated through the heater matrix. When the heater temperature control on the facia is operated, a flap door opens to expose the heater box to the passenger compartment. When the blower control is operated, the blower fan forces air through the unit according to the setting selected.

Air conditioning system
See Section 11.


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