TM 5-2420-231-10
0009
CAB AIR LOUVERS CONTINUED
Table 5. Cab Air Louvers Controls/Indicators.
KEY
CONTROL/INDICATOR
FUNCTION
NOTE
During some conditions, ice may form on air-
conditioning core. Ice can be caused by operating
at low blower speed and maximum cold setting of
temperature switch. It is best to operate at medium
or high blower speed and center range of
temperature switch. If ice blocks core, turn
temperature switch to off position and run blower at
high speed. Ice can also form as a result of a
restricted air filter in cab.
1
Defrost louvers
Two louvers are located in front of cab and two are
located in rear of cab. Move two bars in each defrost
louver to center position to stop airflow; move two bars to
outward position to start airflow.
2
Recirculation grill
Used for recirculation of cab air. Close grill for
overpressure of cab; open grill for maximum heat or
maximum cooling.
3
Main louvers
Used to direct airflow.
4
Cab lower vents
Used to direct airflow. Located in lower right front and
lower right rear area of cab. For maximum airflow, close
defrost, recirculation, and main louvers.
