The Main Parts Of The Cooling System

The cooling system consists of a cooling water pump, a radiator, a cooling fan, a thermostat, a water temperature sensor, a compensation water bucket, a water jacket in the engine block and the cylinder head, and other auxiliary devices.

 

Water Pump

1. Working principle and function

The water pump pressurizes the coolant and forcibly circulates the coolant.

When the water pump impeller rotates, the cooling liquid is thrown to the edge of the impeller under the action of centrifugal force, the pressure of the edge of the impeller increases, and the cooling liquid is sent to the water outlet pipe; at the same time, the pressure at the center of the impeller decreases, and the cooling liquid is sucked into the center of the impeller from the water inlet pipe.

2. Quick identification methods and skills

Some of the cooling water pumps are installed on the cylinder block and driven by the timing belt (timing chain); some are installed on the periphery, that is, on the generator side, driven by the accessory belt.

3. Common faults and solutions

The common faults of water pumps are leakage and corrosion of the water pump impeller. The leakage faults are mostly coolant leakage at the water pump; the corrosion faults of the water pump impeller are high engine water temperature and poor coolant circulation.

The above two faults need to be replaced by the cooling water pump.

 

 

Thermostat

1. Working principle and function

With the level of engine water temperature, the flow of coolant to the radiator and the large and small circulation routes are automatically controlled.

A thermostat is a valve that controls the coolant flow path. It opens or closes the passage of coolant to the radiator depending on the coolant temperature.

2. Quick identification methods and skills

Most engine thermostats are installed at the water outlet above the engine cooling water. This arrangement is convenient for maintenance, and at the same time, when the cooling water is replaced, the air can be easily discharged, and it is not easy to cause cavitation in the water system. The disadvantage is that oscillation will occur when the thermostat works.

Some thermostats are installed in the water outlet pipe of the radiator. This arrangement can reduce or eliminate the oscillation phenomenon of the thermostat and precisely control the coolant temperature, but its structure is complex and the cost is high, and it is mostly used in high-performance cars and cars that often drive at high speeds in winter.

Some thermostats are also installed at the water inlet of the water pump, which overcomes the fluctuations of the above-mentioned engine water temperature.

3. Common faults and solutions

The common fault of the thermostat is that the thermostat cannot be opened, and the fault phenomenon is that the engine coolant does not circulate, resulting in high engine water temperature.

 

Radiator

1. Working principle and function

Coolant flows inside the radiator core and air passes outside the radiator core. The hot coolant cools by dissipating heat to the air, and the cold air heats up by absorbing the heat given off by the coolant. The radiator increases the contact area between the coolant and the air, and uses the air flow to reduce the heat of the coolant to achieve heat dissipation.

2. Quick identification methods and skills
3. The radiator is installed in the front of the vehicle, behind the air conditioner radiator and in front of the cooling fan
4. Connect the coolant water pipe.
5. A warning similar to "Caution of burns" is posted on the tank cover.
6. Common faults and solutions

Common failures of radiators are leaks and blockages.

The fault phenomenon of radiator leakage is that there is water traces of coolant on the radiator. In severe cases, it is accompanied by high water temperature, and the radiator needs to be replaced.

The fault phenomenon of radiator blockage is abnormal coolant temperature. Most of them are rusted due to the use of inferior coolant. The rust blocks the radiator, and the radiator needs to be replaced.

 

Cooling Fan

1. Working principle and function

The role of the cooling fan is to increase the amount of air flowing through the radiator core, enhancing the heat dissipation capacity of the radiator.

When the cooling fan IC (Integrated Circuit Regulator) forms current flow in the coil through the brush, electromagnetic force is generated, and the coil rotates under the action of the electromagnetic force, realizing the conversion of electrical energy into mechanical energy.

2. Quick identification methods and skills

The cooling fan is generally installed in front or behind the radiator, and it is a single fan or a double fan.

3. Common faults and solutions

The common fault of cooling fan is abnormal noise or not working.

The abnormal noise of the cooling fan is caused by the abnormal noise when the cooling fan rotates, and it cannot be solved after cleaning the foreign matter, and the electronic fan needs to be replaced.

If the cooling fan does not work, the water temperature will be high, and it is necessary to eliminate the circuit fault or the cooling fan failure.