If there's one thing we can't live without in our cars all year round, air conditioning is on the list. But many owners are still on the air conditioning of the inner cycle and the outer cycle silly confused.

In the open air conditioning, internal and external circulation is also important to how to choose, we sometimes drive, highway, easy to nod off, not just because of the open after a long time, there is another reason, though not a major, but also plays a certain role, is our car air flow no adjust well, lead to too much carbon dioxide, the car temperature is too high, sultry. Are more likely to make us sleepy and dangerous when driving.

Inner loop

Internal circulation has the function of isolating air from outside the car into the car. The temperature of the car can be rapidly reduced or increased. So, by opening the inner circulation, it can keep warm in winter and cool in summer.

However, the continuous internal circulation, although the car temperature dropped, but the car's people exhaled dioxide will increase, so, every 1 hour to the best transfer to the external circulation or open the window, for a change of air. If the car is parked with the inner loop on and the owner sleeps in the car with no fresh air coming in, there may be a risk of suffocation.

Outer loop

The role of the external circulation is to replenish the fresh air in the vehicle, bringing external air into the vehicle, even if there is no fan, there will be air flow into the vehicle.

When the window is closed, or the car is crowded, and the window can not get enough fresh air, the external circulation can be opened to supplement air. In winter, if the window is too cold, you can close the window and open the external circulation, reduce the moisture in the car and prevent the window from fogging. In the tunnel, if you encounter traffic jam when using the internal circulation, it is suggested to use the internal and external circulation alternately to maintain the air circulation in the car.

Matters needing attention

Do not open the Windows when you turn on the air conditioner. If you open the Windows at the same time, the refrigeration effect in the car will be greatly reduced, and it will waste fuel. The air outlet direction of the air conditioner should not be adjusted at will. According to the characteristics of hot and cold air, the air outlet should be upward when the air conditioner is turned on, and the air outlet should be downward when the heating is turned on.

Do not leave the air conditioning on for a long time, because the engine of the air conditioning itself is a heating body, in order to reduce the loss of the refrigeration system, each time the use of air conditioning time should not be too long, if the car temperature has reached a comfortable temperature, you can turn off the air conditioning, and then open again after a while. But don't turn the air conditioner on and off too often to prevent damage to the air conditioning system.

Do not smoke in the car with air conditioning on, do not rest and sleep in the car with air conditioning on. Remember to turn off the air conditioner before turning it off.