Inlet manifold - Cooling connections (Cooling system - V8)

Inlet manifold - Cooling connections

Coolant leaves the cylinder block via an outlet pipe attached to the front of the air intake manifold. The pipe is connected to the thermostat housing and the radiator by a branch hose off the radiator top hose.

Hot coolant from the engine is also directed from the inlet manifold via pipes and hoses into the heater matrix. Coolant is circulated through the heater matrix at all times when the engine is running.

A further tapping from the inlet manifold supplies coolant to the throttle housing via a hose. The coolant circulates through a plate attached to the bottom of the housing and is returned through a plastic bleed pipe to an expansion tank. The hot coolant heats the air intake of the throttle housing preventing ice from forming.

An Engine Coolant Temperature (ECT) sensor is fitted in the inlet manifold adjacent to the manifold outlet pipe. The sensor monitors coolant temperature emerging from the engine and sends signals to the ECM for engine management and temperature gauge operation. ENGINE MANAGEMENT SYSTEM - V8, DESCRIPTION AND OPERATION, Description - engine management.

Expansion tank

The expansion tank is located in the engine compartment. The tank is made from moulded plastic and attached to brackets on the right hand inner wing. A maximum coolant when cold level is moulded onto the tank.

Excess coolant created by heat expansion is returned to the expansion tank from the radiator bleed pipe at the top of the radiator. An outlet pipe is connected into the pump feed hose and replaces the coolant displaced by heat expansion into the system when the engine is cool.

The expansion tank is fitted with a sealed pressure cap. The cap contains a pressure relief valve which opens to allow excessive pressure and coolant to vent through the overflow pipe. The relief valve opens at a pressure of 1.4 bar (20 2

lbf.in ) and above.

Heater matrix

The heater matrix is fitted in the heater assembly inside the passenger compartment. Two pipes pass through the bulkhead into the engine compartment and provide coolant flow to and from the matrix. The pipes from the bulkhead are connected to the matrix, sealed with 'O' rings and clamped with circular rings.

The matrix is constructed from aluminium with two end tanks interconnected with tubes. Aluminium fins are located between the tubes and conduct heat away from the hot coolant flowing through the tubes. Air from the heater assembly is warmed as it passes through the matrix fins. The warm air is then distributed into the passenger compartment as required. HEATING AND VENTILATION, DESCRIPTION AND OPERATION, Description.When the engine is running, coolant from the engine is constantly circulated through the heater matrix.

Radiator

The 45 row radiator is located at the front of the vehicle. The cross-flow type radiator is manufactured from aluminium with moulded plastic end tanks interconnected with tubes. Aluminium fins are located between the tubes and conduct heat from the hot coolant flowing through the tubes, reducing the cooling temperature as it flows through the radiator. Air intake from the front of the vehicle when moving carries heat away from the fins. When the vehicle is stationary, the viscous fan draws air through the radiator fins to prevent the engine from overheating.

Two connections at the top of the radiator provide for the attachment of the top hose and bleed pipe. A connection at the bottom of the radiator allows for the attachment of the bottom hose to the thermostat housing.

Two smaller radiators are located in front of the cooling radiator. The lower radiator provides cooling of the gearbox oil and the upper radiator provides cooling for the engine oil. MANUAL GEARBOX - R380, DESCRIPTION AND OPERATION, Description. AUTOMATIC GEARBOX - ZF4HP22 - 24, DESCRIPTION AND OPERATION, Description. ENGINE - V8, DESCRIPTION AND OPERATION, Description.