CITROËN C4 Handbook page 100

Ease of use and comfort
8. Air intake / Air recirculation
F Press this button for
recirculation of the interior
air. The indicator lamp in the
button comes on.
Air recirculation enables the passenger
compartment to be isolated from exterior
odours and smoke.
F As soon as possible, press this button
again to permit the intake of outside air and
prevent the formation of condensation. The
indicator lamp in the button goes off.
Avoid prolonged operation in interior air
recirculation mode (risk of misting and
deterioration of air quality).
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9. "REST" function: ventilation
with the engine off
Even with the engine is off, you
can operate the ventilation for a
few minutes.
For example, while you are away from the
vehicle, the passengers can still enjoy some air
circulation without having the engine running.
This function is available after switching on the
ignition, as well as after stopping the engine.
The period that the function is available
depends on the state of charge of the battery.
You can activate the "REST" function while the
air conditioning control screens are on.
On switching on the engine
- The control screens come on: the function
is available.
- Pressing the REST button activates the
ventilation for a few minutes. Activation of
the function is confirmed by the display of
two dashes in the control screens and four
air flow level indicator lamps.
- The function can be deactivated and
reactivated if the control screens are on.
- The screens go off at the end of this
period.