Car engine cooling system Mazda 121 (3)

Cooling circuit
The cooling system mainly consists of a radiator, a water pump, a thermostat and an electric fan. The cooling 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...

Coolant replacement
The coolant must be replaced after repair of parts of the cooling system. Replacement as part of the annual maintenance is not provided. If the repair replaces the...

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

Removal and installation of the thermostat
The removal operations for the 1.3L engine are described here. Instructions for other motors are given at the end of the section. Removing Drain the coolant and collect...

Thermostat check
The thermostat, when the engine warms up, opens the channel for the coolant to the radiator. If the thermostat remains closed due to a fault, the engine will overheat....

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

Removal and installation of the water pump (gasoline 1.3 l)
In the event of a malfunction, the water pump must be replaced - it cannot be repaired. If the pump shaft seal is leaking when the engine is running, coolant will flow...

Removal and installation of the water pump (gasoline 1.25/1.4 l)
Attention: This only describes the differences that you should pay attention to when removing the water pump. Since you need to release the right engine mount, in order...

Removal and installation of the water pump (diesel)
Attention: This only describes the differences that you need to pay attention to when removing the water pump. Removing Remove toothed belt. Attach the toothed belt...

Diagnostics of malfunctions of the engine cooling system
Diagnostics of malfunctions of the engine cooling system Malfunction: the temperature of the coolant is high, the needle of the coolant temperature gauge is in the red...