Coolant circulation (engine hot) (Cooling system) (page 2 of 2)

COOLANT CIRCULATION The coolant circulation through the cylinder block and heads, does not change when normal running Operation temperature is reached and the thermostat opens. But with the thermostat open, coolant also flows through When the engine is started from cold the thermostat the top hose to the radiator where it is cooled and prevents any coolant circulation through the radiator drawn back into the pump via the bottom hose. by closing off the top hose. During the engine warm up period, the water pump, pumps coolant around the Throttle housing heating cylinders to the rear of the cylinder block along the main galleries in both cylinder banks. At the rear of The base of the throttle housing is heated by a flow of the cylinder block the coolant rises through a large coolant from the inlet manifold which returns through a port in each cylinder head/block joint face, and then long hose, to the top right corner of the radiator. The flows forward to connect with ports at the front of the throttle housing is heated to prevent throttle disc icing. inlet manifold. From the manifold the coolant is carried by an external pipe to the heater unit and from the heater through another external pipe to the pump inlet.