You do not need to make the radiator fan direct. These cars have good sensors and whenever engine temperature starts exceeding the threshold, the cooling fan automatically kicks in. It is usually a peace of mind which people gets that their car radiator fan is direct and therefore, won't suffer from any overheating issue. If engine is already bad (blown head gasket, bad pcv valve etc) or cooling system is out of order (leaking hoses, jammed water pump etc), direct fan won't make any difference.