Buick 2009 Enclave - Manual (Page 146)

h (Recirculate): Press to turn the recirculation mode
on. An indicator light comes on to show that recirculation
is on. This mode recirculates and helps to quickly heat or
cool the air inside the vehicle. It can be used to prevent
the outside air and odors from entering the vehicle.
Operation in this mode during periods of high humidity
and cool outside temperatures may result in increased
window fogging. If window fogging is experienced, select
the defrost mode. To prevent the air inside the vehicle
from becoming stale, after five minutes recirculation lets
some outside air into the vehicle.
Rear Window Defogger
The rear window defogger uses a warming grid to
remove fog from the rear window.
< (Rear): Press turn the rear window defogger on or
off. An indicator light comes on to show that the
rear window defogger is on.
The rear window defogger only works when the ignition
is in ON/RUN. The rear window defogger stays on for
about 20 minutes after the button is pressed. If turned on
again, the defogger only runs for about 20 minutes before
turning off. The defogger can also be turned off by turning
off the engine.
The heated outside rearview mirrors, help to clear fog
or frost from the surface of the mirror when the rear
window defog button is pressed.
Do not drive the vehicle until all windows are clear.
Notice: Do not use anything sharp on the inside
of the rear window. If you do, you could cut or
damage the warming grid, and the repairs would not
be covered by the vehicle warranty. Do not attach
a temporary vehicle license, tape, a decal or
anything similar to the defogger grid.
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