Module Components

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Air enters the Heater, Ventilation And Air Conditioning (HVAC) module where it may be cooled for air conditioning or defrost modes, and then heated as necessary before being sent to the proper outlets for discharge into the passenger compartment. Within the HVAC module, valves (doors) guide the airflow in response to the position of the mode control on the HVAC control head.

Other components of the air distribution system include the plenum, the blower motor, the evaporator core and the heater core. The plenum provides a source of outside air to the system. The blower motor draws air from the plenum or from the vehicle interior into the HVAC module and forces it through the air distribution system to the outlets. The evaporator core is a part of the refrigeration system. The evaporator cools the air from the blower motor when operating in an air conditioning or defrosting mode. The heater core provides heat which can be used to warm the air downstream from the evaporator core.