Pontiac 2001 Montana Owner's Manual page 238

Turn the fan knob to the desired setting for the amount
of air to be directed to the rear of the vehicle. The
temperature of the air will be the same as the air in the
front of the vehicle. The rear fan control in the
instrument panel switchbank has an "R" setting which
allows the rear passengers to use the rear climate control
knobs to adjust the air through the rear air outlets.
Rear Comfort Controls
The rear climate control knobs are in the panel above
the driver's seat.
Turn the temperature knob counterclockwise (to the blue
area) for cooler air, or clockwise (to the red area) for
warmer air.
To maintain a comfortable temperature in the rear, use
either rear fan knob to adjust the force of air coming
through the rear outlets.
Select the desired climate control mode using the
directional controls on the instrument panel (see "Mode
Knob" earlier in this section). The mode you choose will
regulate both the front and rear climate control systems.
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