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REPAIR MAINTENANCE OPERATION OF MOTOR VEHICLES
Mazda 323 (1985 release)

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Mazda 323
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Mazda
323
Introduction
Gasoline engines
Engine oil
Engine cooling system
Coolant circuit
The antifreeze concentrate
Substitution coolant
Checking the tightness of the cooling system
Removal and installation / check thermostat
Removal and installation of the water pump
Removing and installing radiator
Removal and installation of the fan motor
Checking the thermal switch
Ignition system
The power supply system, the carburettor, fuel injection system
Diesel engine
Exhaust
Coupling
Manual gearbox
Automatic Transmission
Suspension and steering system
Brakes
Wheels and tires, a body, car coloring, care of the car
Electrical system
Heater, illumination system, devices
Controls and operation receptions
Electrical diagrams
 


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Engine cooling system



Coolant circuit

OT, B6, BP (SOHC)

1 - expansion tank
2 - radiator
3 - radiator fan
4 - a cover of a radiator
5 - expansion tank model F

6 - water pump
7 - Thermostat
8 - thermal switch
9 - the fan relay

The cooling system consists of a radiator, water pump, thermostat and electric fan.

The coolant circuit is controlled thermostatically. While the engine is cold, coolant circulates only in the engine block heater and heat exchanger. When heated coolant thermostat opens and the cooling liquid starts to flow through the radiator. The coolant is driven by a water pump, which in turn is driven by a V-belt. The coolant passes through the radiator and is cooled down from above with air flowing through the plate.

The electric fan provides additional cooling. When the coolant temperature increases to + 91 ? C, thermal switch includes a relay blower. If the coolant temperature falls below + 84 ? C, the thermal switch automatically turns off the fan.

Coolant reservoir serves as a surge tank and collects fluid expands when heated and after cooling the engine returns it back to the circuit. Due to this circuit is constantly filled and provides good cooling. Refill the coolant should be only through the expansion tank.

The radiator fan may start automatically when the engine is off and the ignition on. This process is caused by the heat in the engine compartment, may be repeated several times. When working in the engine compartment on the hot engine should always be aware of the possibility of unexpected inclusion of the fan. Therefore, as far as possible when working in the engine compartment, turn off the ignition.





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Coolant circuit

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