Car engine cooling system Mazda 121 (3)

Cooling system circuit
The cooling system mainly consists of a radiator, water pump, thermostat and electric fan. The cooling system circuit is controlled by a thermostat. When the engine is...

Coolant — Basic Information
The engine cooling system is filled at the factory with a solution of water and antifreeze with anticorrosive additives. Antifreeze prevents freezing and corrosion in...

Replacing the coolant
The coolant must be replaced after repairs to the cooling system components. Replacement is not provided for in the annual maintenance. If the cylinder head, cylinder...

Checking the cooling system
Leaks in the cooling system and the operation of the safety valve in the expansion tank cap can be checked using a special device for testing the system under pressure....

Removal and installation the thermostat
The removal procedures for the 1.3L engine are described here. Instructions for other engines are provided at the end of the section. Removal Drain and collect the...

Checking the Thermostat
The thermostat opens the coolant passage to the radiator when the engine warms up. If the thermostat remains closed due to a fault, the engine will overheat. This can be...

Removal and installation the radiator and fan
The fan can be removed without the radiator, especially since the preliminary work is almost identical. Instructions that only concern the removal of the fan are...

Removal and installation the water pump (petrol 1.3 l)
If the water pump is faulty, it must be replaced - it cannot be repaired. If the pump shaft seal is loose, coolant will leak from the cylinder block when the engine is...

Removal and installation the water pump (petrol 1.25/1.4 l)
Note: This only describes the differences that you need to pay attention to when removing the water pump. Since the right engine mount needs to be released, a lift or...

Removal and installation the water pump (diesel)
Note: This section only describes the differences that you need to pay attention to when removing the water pump. Removal Remove the timing belt. Secure the toothed belt...

Diagnostics of engine cooling system faults
Diagnostics of engine cooling system faults Malfunction: The coolant temperature is high, the coolant temperature gauge needle is in the red zone or the indicator lamp...

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