Hi Abdul, the engine's outside cooling is by the main fan which is driven by the serpentine belt. The other 2 are auxcillary fans which come on only when the engine reaches about 100C. Both my 2 fans come on at the same time and only for a few seconds, presumably to add extra cooling power for the radiator when its very hot. I don't think it will be wise to take any of the fans off as they were designed to keep the engine at a certain temp. and not higher or you will have a blown engine. Malaysia is a lot hotter than here all year round so the fans should be a necessity. Last weekend, my car was at the indie and he was testing my aircon . The temp. outside was about 30C and my 2 aux. fans were firing off and on while the car was at standstill in the workshop.