Cooling System: Description and Operation

Engine cooling is via a low volume, high velocity system, which achieves a very fast warm up. The temperature of the combustion chambers is reduced along with a more even temperature distribution. The temperature of the bores is increased.

From the pump, coolant flows into each bank of the cylinder block. In each bank, approximately 50% of the coolant cools the cylinder bores and the remainder is diverted through the bypass gallery to the cylinder head.

With the thermostat closed, coolant returns directly to the pump through the bypass on the thermostat housing.

With the thermostat open, coolant returns to the pump via the radiator.

The cooling system uses a mixture of water and Jaguar Anti-Freeze/Inhibitor (Dow 542).

The cooling system for the supercharged engine is very similar to the normally aspirated engine, but with the addition of a water cooled, intake air charge cooling system. This comprises a radiator, an electrically operated water pump and two charge air cooler assemblies (heat exchangers) - one for each bank. The system works independently but is connected to the main cooling system at the bottom hose to allow for thermal expansion and to help to prevent unwanted circulation.

The condenser for the air conditioning system fits between the coolant main radiator and the charge air cooling system radiator.





A coolant drain plug is located at the rear of the cylinder block.

Coolant may be drained from the A-bank, by removing the coolant pipe from behind the starter motor.

For vehicles fitted with the cold climate package, a cylinder block heater (shown) replaces the drain plug located on the B-bank.