Waterproof cooling fan using method

"Waterproof Cooling Fan" often a lot of people, when replacing the radiator fan will buy direct power, a large fan blades that the wind was such a fan is large enough, there is a very good cooling effect. These perceptions are very wrong. Tell you when to buy a fan is required to have some knowledge of the purchase.
1, "Waterproof Cooling Fan" radiator fan blades are not the bigger the better, the large fan blades during operation of the process, the resistance is very big, when the choice of blades can be moderate;
2, is not a big fan of power, cooling, the better, the power over the General Assembly affecting the normal use of the vehicle, the choice, and to be selected according to actual usage;
3, "Waterproof Cooling Fan" to choose a good quality radiator fan, after the purchase of the fan speed to the corresponding debugging.