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This study describes the influence of fan system electric power on the heat performance of engine cooling module versus vehicle speeds, from idle to maximum speed. Depending on the fan system electric power from 60 to 800 watts, for example, and even if the fan is switched on, their behaviors are different versus vehicle speeds. The 70 watts fan has its influence on the heat performance of engine cooling module until medium vehicle speeds but the high electric fan system power has its influence up to maximum speed. This study will focus on this phenomena, particularly, the difference between fan on and off is function of vehicle speeds. A simple simulation model [1] and [2] will be used to explain this phenomena. Also presented in this paper is the heat performance of cooling radiator and cooling module on the several vehicles tested in the climatic wind tunnel according to the cooling specifications.

This study is the continuation of our study published in reference 1 concerning the cooling radiator performance on the vehicle. In addition to the last paper, two main parameters will be shown: the air velocity through the A/C condenser and its heat performance. They will be studied and presented, particularly,: The influence of the cooling radiator (geometry and performance), The influence of size and position of A/C condenser to the cooling radiator, The influence of the electric fan (size, power and performance, fan on or fan off), The influence of fan shroud (without fan shroud, with full fan shroud or with partial fan shroud), The influence of vehicle (pressure coefficient, grill, size of air inlet, under-hood, size of under-hood air outlet, etc).