4 Air Distribution Control Automotive Heating Air Conditioning

4. Air Distribution Control Automotive – Heating & Air Conditioning Air Distribution Control Topics covered in this presentation: n n Single and dual distribution assemblies Blend-air and stacked core re-heat systems Ducts and louvers Single & dual systems Class. Act SRS enabled.

4. Air Distribution Control Automotive – Heating & Air Conditioning Introduction Air distribution systems are used to direct air flow into the passenger compartment. Airflow is controlled by flaps and mixing doors. The A/C control panel is mounted in the instrument cluster. Temperature control lever The airflow through the heater core is controlled by the temperature selector. A multi-speed fan is used to change the airflow rate. Fan control Next >

4. Air Distribution Control Automotive – Heating & Air Conditioning Typical Heater & A/C Assembly Layout A single distribution heater system, shown below, is split into three sections. Air Inlet Section Filtered fresh air in Plenum Section Evaporator Heater core Air Distribution Section Air to defrost panels Fan Intake door Recirculated air in Air mix (blend) door Floor air out Air to panel outlets Next >

4. Air Distribution Control Automotive – Heating & Air Conditioning Question 1 In a single distribution heater system, the fan is situated in the plenum section. Is this true or false? Answer True or False.

4. Air Distribution Control Automotive – Heating & Air Conditioning Air Distribution Assembly Location The air distribution assembly is normally located at the back of the engine compartment, and is fixed to the bulkhead. Fan housing Evaporator housing System hoses Heater and A/C controls Air distribution assembly with heater core Engine Compressor Condenser Next >

4. Air Distribution Control Automotive – Heating & Air Conditioning Question 2 Where is the air distribution assembly normally located? A) Behind the front grill B) At the back of the engine compartment C) Below the engine bulkhead D) Behind the dashboard

4. Air Distribution Control Automotive – Heating & Air Conditioning Air Flow Through Heater & A/C Assembly Defrost air out Filtered fresh air in Air mix (blend) door Fan Intake door Evaporator Floor air out Arrows show the air flow through and around the heater and A/C assembly. Recirculated air in Heater core Next >

4. Air Distribution Control Automotive – Heating & Air Conditioning Question 3 Where does defrost air normally go to? A) Floor level B) The windscreen C) The evaporator D) The seats

4. Air Distribution Control Automotive – Heating & Air Conditioning Blend-Air Reheat System The blend-air reheat system works by re-heating and mixing cooled, dried air from the evaporator, using the blend door. Lines to A/C system Cold air from evaporator Filtered fresh or recirculated air in Air blend door Heater core Evaporator Hot water lines from engine cooling system to heater core Blended air to vehicle interior Hot air from heater core Next >

4. Air Distribution Control Automotive – Heating & Air Conditioning Stacked Core Reheat System The stacked core re-heat system works by controlling the temperature of the heater core. Filtered fresh or recirculated air in Lines to A/C system Evaporator Cold air from evaporator Heater core Reheated air to vehicle interior Hot water lines from engine cooling system to heater core Heater valve (temperature control) Next >

4. Air Distribution Control Automotive – Heating & Air Conditioning Question 4 Which is the correct sequence for operations on the air in an a/c system? A) Cooled, heated, filtered B) Heated, cooled, filtered C) Filtered, cooled, heated D) Heated, filtered, cooled

4. Air Distribution Control Automotive – Heating & Air Conditioning Typical Control Panel/Head The typical panel below contains all the controls and information for the vehicles heating and ventilation. Temperature control lever Air distribution control lever Air conditioning on/off switch Fan control Next >

4. Air Distribution Control Automotive – Heating & Air Conditioning Control Panel/Head Cable Connections The control levers and switches are connected to the distribution controls behind the control panel. Air conditioning control lever Temperature control lever Fan control connector Air conditioning control cable Temperature control cable Air distribution control cable Air conditioning on/off switch connector Next >

4. Air Distribution Control Automotive – Heating & Air Conditioning Heating System Inlets and Outlets Inlet and outlet ducts are used to recycle and change the air within the passenger compartment. Side window outlet Windscreen defroster nozzle Filtered fresh air in Side window outlet Instrument panel outlets Re-circulated air in Floor outlets Instrument panel outlets Next >

4. Air Distribution Control Automotive – Heating & Air Conditioning Louver Construction Outlet louvers are used to control and direct heating and ventilation air flow into the passenger compartment. Air door control wheel Air control door Louver housing Louver direction control Next >

4. Air Distribution Control Automotive – Heating & Air Conditioning Front & Rear Passenger Compartment Ducts Compartment ducts are used to direct heating and ventilation air around the vehicle, luxury vehicles have very complex systems. Side window outlet Front compartment ducts Defroster outlets Instrument panel outlets Side window outlet Rear compartment outlets Rear compartment ducts Next >

4. Air Distribution Control Automotive – Heating & Air Conditioning Question 5 What is the name of the parts of the vehicle used to control the flow of air into the passenger compartment? A) Duct B) Louver C) Outlet D) Nozzle

4. Air Distribution Control Automotive – Heating & Air Conditioning Dual-Zone Distribution System Dual-zone heating and ventilation distribution systems allow for personal settings, when selecting heating and ventilation temperatures. Driver windscreen outlet Driver panel outlets Passenger windscreen outlet Passenger panel outlets Driver defrost door Driver floor outlets Driver mode door Driver air mix (blend) door Filtered fresh air in Heater core Evaporator Fan Passenger floor outlets Passenger defrost door Passenger air mix (blend) door Passenger mode door Recirculated air in Next >

4. Air Distribution Control Automotive – Heating & Air Conditioning Summary You should now be aware of: n Single and dual distribution assemblies n Blend-air and stacked core re-heat systems n Ducts and louvers n Single & dual systems End >