General information
1. Cooling system - closed type, includes belt driven pump, aluminum radiator with electric fan (two fans), heater core, thermostat and various hoses and sensors. The system pump is driven by either an auxiliary belt or a timing belt, depending on the model. All models are equipped with a fan driven by a viscous coupling, which in turn is driven by an auxiliary belt. The system operates in the following way.
2. Cold coolant flows through the lower radiator hose to the water pump. which drives it through the cylinder block, channels in the head of the block, and (if provided) oil cooler. After cooling the block channels, combustion chambers, and valve seats, the heated coolant passes through the heater radiator and returns to the block through the water pump. The thermostat on a cold engine is closed, preventing cold coolant from entering the engine.
3. As soon as the coolant reaches a certain temperature, the thermostat will open and the coolant will circulate through the radiator of the cooling system, passing into the engine through the lower hose. The heated coolant enters the radiator through the upper hose. In the radiator, the liquid is cooled by the oncoming air flow as the car moves forward. If necessary, the air flow is additionally created by a fan (fans). After passing through the radiator, the coolant repeats the cycle.
4. The operation of the fan is controlled by a viscous coupling. The clutch is driven by the accessory belt and transmits the rotation to the fan via a temperature sensitive fluid clutch. At low temperatures, the impeller rotates freely on the clutch. At a certain temperature, the internal clutch valve opens, the clutch engages and the clutch transfers rotation to the fan. If the temperature drops, the valve closes and the impeller turns freely again.
5. The electric fan is triggered by the command of the thermostatic sensor. When a certain temperature is reached, the sensor is triggered, power is supplied to the fan - the fan rotates. When the temperature falls sufficiently, the reverse process occurs.
6. On models with automatic transmission, a gearbox hydraulic fluid cooler is built into the radiator. The automatic transmission is connected to the radiator by two tubes through which the liquid circulates through the cooler, remaining within operating temperature limits.
Precautionary measures
Do not try to open the cap of the expansion tank or touch the components of the cooling system on a hot engine - there is a serious risk of scalding. If you still need to remove the cover (although it is not recommended), before depressurizing the system. Cover the lid with a thick cloth to prevent scalding and open it slowly. When the hissing stops, indicating that the pressure has been relieved, carefully open the lid. If the hissing reappears, wait until it stops. Keep away from the lid at all times.
Do not allow antifreeze to come into contact with skin or painted body surfaces. In case of contact, rinse immediately with plenty of water.
If the engine is hot, the electric fan may run even if the engine is not running. Keep hands, hair and rags away from the fan when working under the hood.
When operating in an air-conditioned vehicle, read the warnings in paragraph 10.
Visitor comments