As the heart of the vehicle, the engine is sometimes very durable and sometimes very delicate. To make it work well, the first condition is to ensure that it runs in a suitable temperature range. What does it rely on? The cooling system.
Everyone knows that after a night’s rest, when the vehicle is restarted, the engine does not work in the optimal temperature range right away. There is a process of heating up and keeping it running at a suitable temperature. When the engine is just started, in order to make the engine reach the operating temperature faster, the coolant only circulates in the water channel inside the engine, which is the small cycle.
When the water temperature gradually rises and reaches 76°C, the main valve of the thermostat will gradually open, and the auxiliary valve will also remain open at a certain proportion. At this time, part of the coolant will enter the large circulation water channel and flow through the radiator to release excess heat, and then reunite with the coolant in the small circulation water channel, so that the engine can run stably in the optimal temperature range of 85-95°C.
When encountering heavy load climbing, acceleration overtaking and other situations that require great power, the engine temperature will rise sharply. When it rises to 86℃, the thermostat will fully open the main valve, and the auxiliary valve will completely close the small circulation channel. The coolant will only flow through the water tank radiator and dissipate heat through the cooling fan, thereby achieving the effect of lowering the water temperature. The process of coolant flowing through the engine body and the radiator is the large cycle.
In summer, due to the high outside temperature, the engine will heat up faster, the small cycle will be maintained for a short time, and it will enter the large cycle faster, and the corresponding cooling fan will start more frequently. In winter, the outside temperature is low, the corresponding water temperature will rise more slowly, and the time in the small cycle will be longer.
Whether it is the large and small cycles mentioned above, or the frequency and speed of the fan opening, they are all to keep the engine in the optimal operating temperature range. Different engine cooling fans have different control methods. Mechanical fans rely on memory metal reeds for connection, while electronically controlled silicone oil clutch fans can adjust the speed more accurately through water temperature sensors.
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Post time: Jul-28-2025