ventilation, and air-conditioning system ( HVAC) operates in two basic modes:
Autos & Vehicles
- Fresh Air Mode (Recirculation OFF)
Outside air is drawn into the vehicle
Air passes through the cabin air filter
The system heats or cools the air
Air is distributed throughout the cabin
This mode continuously replaces interior air with oxygen-rich outdoor air.
Vehicle air filters
2. Recirculation Mode (
Recirculation ON)
A motorized flap closes off the outside air intake
The system reuses air already inside the cabin
Air is cooled or heated repeatedly
This creates
