What components are labeled in the heater unit diagram?

The diagrams label the ventilator door, air mix door, heater duct, outside air inlet, heater core, foot and defroster door, and intake door, plus the air control lever, intake lever, temperature control lever, and fan lever on the control panel.

What airflow modes does this page cover?

It shows three modes: Defroster (air routed to the defroster outlets, ①), Ventilation (air routed to the ventilator outlets, ③), and Foot (air routed to the foot outlets, ②).

How many fan speeds does the system have?

The fan lever is shown with positions OFF, 1, 2, 3, 4, and a footnote states that some switches have three speeds.

Where does the air come from in Foot mode versus Ventilation mode?

The Foot mode diagram shows recirculating air, while the Ventilation and Defroster diagrams show outside air entering through the intake door.

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Nissan Micra Heater Air Flow & Component Layout Diagram (Service Manual HA-2)

HVAC air-flow schematic showing defroster, ventilation, and foot modes

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HVAC air-flow schematic illustrating defroster, ventilation, and foot modes with control-lever positions.

AI caption February 2006 · Photo 343 of 412

This is page HA-2 from a factory service manual, titled "Air Flow and Component Layout — Air Flow." It illustrates how the heating/ventilation (HVAC) system distributes air through the vehicle. A top isometric drawing of the dashboard shows numbered arrows for the three air outlet paths: ① defroster/ventilator outlets, ② foot outlets, and ③ side ventilator outlets. Three cutaway diagrams of the heater unit show internal air routing for each mode. The Defroster diagram labels the ventilator door, air mix door, heater duct, outside air inlet, heater core, foot and defroster door, and intake door, with arrows marked "① To defroster." The Ventilation diagram shows outside air routed "③ To ventilator." The Foot diagram shows recirculating air directed "② To foot." Each mode includes a drawing of the dash control panel showing the correct positions of the air control lever, intake lever, temperature control lever (COLD–HOT), and fan lever (OFF 1 2 3 4). A footnote states "Some switches have three speeds." Illustration reference code RHA001 appears at the bottom. Readers can learn heater box component names and how the control levers should be set to achieve defrost, ventilation, or foot-level airflow.

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Frequently asked questions

What components are labeled in the heater unit diagram?: The diagrams label the ventilator door, air mix door, heater duct, outside air inlet, heater core, foot and defroster door, and intake door, plus the air control lever, intake lever, temperature control lever, and fan lever on the control panel.
What airflow modes does this page cover?: It shows three modes: Defroster (air routed to the defroster outlets, ①), Ventilation (air routed to the ventilator outlets, ③), and Foot (air routed to the foot outlets, ②).
How many fan speeds does the system have?: The fan lever is shown with positions OFF, 1, 2, 3, 4, and a footnote states that some switches have three speeds.
Where does the air come from in Foot mode versus Ventilation mode?: The Foot mode diagram shows recirculating air, while the Ventilation and Defroster diagrams show outside air entering through the intake door.