Air Distribution

The purpose of the air distribution system is to route air to the designated registers. This is accomplished when air enters the plenum through the fresh/recirculated air inlet and is routed to the desired outlets by use of distribution doors. The incoming stream of fresh air is passed through a pollen filter.

The air distribution system consists of the heater core, air conditioning (A/C) evaporator core, A/C blower motor and all of the distribution doors. All of the air is mixed and distributed inside of the plenum chamber, depending on the distribution door positions.

Air ducts route air to specified areas of the air distribution system. These areas are the floor ducts, panel registers, side window demister, and defrost nozzles. The panel registers are adjustable and are used to aim the discharged air to a required area. The floor ducts, side window demisters, and defrost nozzles are non adjustable.

The distribution door positions are determined by the control components. The distribution doors open and close air flow passages inside of the air distribution system to establish air flow direction. There are two distribution doors inside of the plenum assembly, panel/defrost door and panel/floor door. The panel/defrost door can be positioned to either block off or allow air to the panel ducts or defrost ducts. The panel/floor door can block off or allow air to the panel/defrost ducts or the floor duct.