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OM3211 08/11
Air Conditioner Control Switch
Air Conditioner control switch (5,
Figure 32-3) is a three position
switch that controls the air condi-
tioner to cool the cab air. Moving
the switch to the left activates the
air conditioner. (The fan control
must be switched ON for the air
conditioner to function.) When
the switch is in the center position, the air conditioner
and the heater are both activated. When the switch is
moved to the right side, only the heater is activated.
FIGURE 32-3. A/C & HEATER CONTROLS
Operator Cab and Controls - Section 32
Heater/Air Conditioner Vents
Heater/air conditioner vents (6, Figure 32-3) may be
rotated 360°. There are three vents in the heater/air
conditioner compartment (shown in Figure 32-3), four
vents across the top of the panel, and one vent each
in the RH and LH instrument panel pods. Air flow
through the vents is controlled by manually opening,
closing or turning the louvers.
RETARDING CAPACITY CHART
Retarding capacity chart (8, Figure 32-1 & shown
below) provides the recommended maximum truck
speeds for descending various grades with a fully
loaded truck.
The operator should reference the retarding capacity
chart before descending any grade with a loaded
truck. Proper selection of road grade, truck speed,
transmission gear range, and use of the retarder
lever and/or brake pedal are required to maintain a
safe speed.
Page 32-5
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