en موتور احتراق داخلی Internal Combustion Engines (ICE, ...) پژوهشي Research <span style="font-size:11pt"><span style="line-height:150%"><span style="font-family:Calibri,sans-serif"><span style="font-size:12.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times=""><span style="color:black">One of the most important aspects of designing passenger cars is the engine cooling. This process would significantly affect the vehicle performance. This study has been conducted both theoretically and experimentally to reveal the influences of different involved parameters of cooling. The current research is implemented in order to examine the effects of 2-speed radiator fan utilization rather than the 1-speed type. For this aim, the new modified fan is considered and the experimental data are obtained to compare the results with those of the old one. Additionally, the effects of parameters such as ECU strategy, radiator fin density as well as the radiator plate geometrical properties are considered in the analysis. As a prominent result, the experimental results show a substantial effect of considering 2-</span></span></span></span><span style="font-size:12.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">speed radiator fan and choosing a better strategy for ECU on the cooling performance in the vehicle.</span></span></span> <span style="font-size:12.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">The experimental results show that employing 2-speed fan instead of single-speed and 900 fin/m fin density instead of 780 fin/m decreases coolant outlet temperature of radiator by 6.1% and 7.1% in the same condition, respectively.<span style="color:black"></span></span></span></span></span></span></span><br> &nbsp; Cooling, ECU strategy, Radiator, Fan speed, Fin density. 4579 4588 http://ase.iust.ac.ir/browse.php?a_code=A-10-788-1&slc_lang=en&sid=1 Alireza Batooei batooei@iust.ac.ir 180031947532846004777 180031947532846004777 Yes Iran University of Science and Technology, Tehran, Iran Ahad Amiri ahad_amiri@alumni.iust.ac.ir 180031947532846004778 180031947532846004778 No Automotive Industries Research and Innovation Center, Tehran, Iran Ali Qasemian qasemian@iust.ac.ir 180031947532846004779 180031947532846004779 No Iran University of Science and Technology, Tehran, Iran