Operating tips
● When the engine coolant temperature and outside air temperature are low, the air flow from the foot outlets may not operate for a maximum of 150 seconds. However, this is not a malfunction. After the coolant temperature warms up, air flow from the foot outlets will operate normally.

The sunload sensor, located on the top of the instrument panel on the driver’s side, helps the system maintain a constant temperature. Do not put anything on or around this sensor.
See also:
Overview
The Altima is a mid-size car currently being manufactured by the Japanese
automaker Nissan, and is arguably a continuation of the "bloodline" that began
with the Nissan Bluebird in 1957. ...
Warning/indicator lights and audible reminders
Warning/indicator lights and audible reminders ...
Air recirculation button
Air recirculation button
NOTE:
The air recirculation feature is available
only on those vehicles equipped with air
conditioning.
On position (Indicator light on):
Interior air is recirculate ...
