Using the fan for measurement the air flow through the cooling system radiator

Possibility of using the regular fan of the cooling system for measurement the air flow through a radiator is considered. Researches established that under the influence of running air flow at car movement the electric fan rotates. Frequency of the fan rotation is proportional to air flow through a radiator. Under the influence of air flow the electric motor of the fan passes to a generator mode, that it is possible to use for measurement the air flow. This method of measurement with success can be used when performing bench and road tests of the cooling system. The method possesses high precision of measurements. Results of researches the fan behavior in different conditions of intake the air through a cooling system radiator are given.