DESCRIPTION AND OPERATION

The cooling system consists of:

l Radiator

l Water pump

l Thermostat

l Cooling fan

l Coolant reservoir

l Interconnecting hoses and pipes

l Cooling fan motor

l Cooling fan switch

l Cooling fan relay

When coolant temperature is cold, the thermostat is in the closed position and the coolant flow is restricted to the engine block, cylinder head, intake manifold and heater. As the coolant temperature increases, the thermostat opens, allowing a portion of the coolant to pass into the radiator. The coolant flows through the radiator tubes and is cooled by air passing over the cooling fins powered by the cooling fan. Coolant is then circulated from the lower radiator outlet through the water pump and into the cylinder block to complete the circuit.

Coolant circulation is provided by a conventional centrifugal water pump which discharges into the front of the engine block. The water pump is driven by the crankshaft through a V-belt.

WARNING:
WHEN WORKING IN THE ENGINE COMPARTMENT, STAY CLEAR OF THE FAN. BECAUSE IT IS ELECTRIC AND TEMPERATURE SENSITIVE, IT CAN START AT ANY TIME IF THE IGNITION IS ON.

The cooling fan is driven by an electric motor which, in turn, is activated by coolant temperature. When the coolant temperature rises above 97°C (207°F), the cooling fan switch opens and engages the cooling fan.

Engine Cooling Fan