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 anti-corrosion additives. Antifreeze prevents freezing and corrosion in...

Replacing the coolant
The coolant must be replaced after repair of the cooling system components. Replacement is not provided as part of 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
This section describes removal procedures for a 1.3L engine. Instructions for other engines are provided at the end of the section. Removal Drain the coolant and collect...

Checking the Thermostat
When the engine warms up, the thermostat opens the channel for coolant to the radiator. If the thermostat remains closed due to a fault, the engine will overheat. This...

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 fan removal are indicated...

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 leaking, coolant will leak from the cylinder block while the engine...

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

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

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

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