FAN BLOWER : The blower is used for moving air from either an outside source- referred to as vented air or from cabin air past the heater core or air conditioning evaporator. In doing so, it causes a heat transfer either to the inside of the car or from the inside to the outside. The majority of the vehicles have a blower motor under the dash, close to the kick panel on the right side of the car. There are, however, different locations for the heater core and evaporators. The blower will always be close the both. On a Cadilac, for examples, the blower motor is under the hood in the center of the firewall right above the rear valve cover.