Global Machinery Company Sierra 1999 - Manual (Page 163)

yellow blue
3-3
Heater and Air Conditioning Comfort
Controls (If Equipped)
Fan Knob
The knob on the left side of the heating and air
conditioning control panel adjusts the fan speed. To
increase airflow, turn the knob clockwise. To decrease
airflow, turn it counterclockwise. To turn the fan off,
turn the knob counterclockwise to OFF.
Temperature Knob
The middle knob on the control panel lets you select the
relative temperature of the air flowing into the passenger
area of your vehicle. Turn the knob clockwise toward
the red area for warmer air. Turn the knob
counterclockwise toward the blue area for cooler air.
Mode Knob
The right knob on the control panel allows you to
choose the direction of air delivery.
PANEL: This setting directs the air through the
instrument panel outlets and the center floor console
(if equipped).
BI - LEVEL: Air is delivered through the
instrument panel outlets and center floor console outlets
(if equipped) as well as the heater floor outlets. The air
flow can be divided between PANEL and HEATER
depending upon where the knob is placed between the
settings. Pressing the A/C button while in this mode
causes cooler air to come out of the instrument panel
outlets and center floor console outlets (if equipped) and
warmer air to come out of the heater floor outlets over a
wider range of temperature knob positions.
HEATER: This setting directs most of the
warmed air through the heater floor outlets and center
floor console outlets (if equipped), as well as some air
through the windshield defroster outlets and side
window defroster outlets. If air from the center floor
console outlets is not desired, turn the vents off at
the console.