CITROEN Grand C4 PICASSO Owner's Handbook Manual page 114

Comfort
Air conditioning On/Off
The air conditioning is designed to
operate efficiently in all seasons, with
the windows closed.
It allows you:
- in summer, to lower the temperature,
- in winter, above 3 °C, to improve demisting.
Switching on
Press the "A/C" button to activate the air
conditioning
When the indicator lamp under the button
is on, the air conditioning function is
activated.
The air conditioning cannot operate when the
air flow is set to off.
Switching off
Press the "A/C" button again to deactivate
the air conditioning
When the indicator lamp under the button
is off, the air conditioning function is
deactivated.
112
Air intake/Air recirculation
The intake of exterior air avoids misting of the
windscreen and side windows.
Air recirculation prevents exterior odours and
smoke from entering the passenger compartment.
This function also allows faster heating
or cooling of the air in the passenger
compartment.
Press this button to choose
the mode for air entry to the
passenger compartment.
When the indicator lamp under the button is off,
the intake of exterior air is active.
When the indicator lamp under the button is
on, air recirculation is activated, the intake of
exterior air is off.
Avoid prolonged operation of the air
recirculation function (risk of misting
and of deterioration of the air quality).
"Mono" function
The comfort setting for the passenger's side
can be indexed to the driver's comfort setting
(mono-zone).
From the secondary page of the " Air
conditioning " menu:
Press this button to activate /
deactivate the "Mono" function.
The indicator lamp in the button
is on when the function is
activated.
The function is deactivated automatically when
the passenger uses their temperature setting
buttons.