RAM Commercial CHASSIS CAB 3500 2021 Owner's Manual page 65

Attempting to use Recirculation while in this
mode causes the LED in the control button to
link, and then turn off.
Front Defrost Setting
Turn the mode control knob to the
Front Defrost mode setting. Air comes
from the windshield and side window
demist outlets. When the defrost
button is selected, the blower level may increase.
Use Defrost mode with maximum temperature
settings for best windshield and side window
defrosting and defogging.
Rear Defrost Button
Push and release the Rear Defrost
Control button to turn on the rear
window defroster and the heated
outside mirrors (if equipped). The Rear
Defrost indicator illuminates when the rear
window defroster is on. The rear window
defroster automatically turns off after
10 minutes.
CAUTION!
Failure to follow these cautions can cause
damage to the heating elements:
Use care when washing the inside of the rear

window. Do not use abrasive window
cleaners on the interior surface of the
window. Use a soft cloth and a mild washing
solution, wiping parallel to the heating
elements. Labels can be peeled off after
soaking with warm water.
Do not use scrapers, sharp instruments, or

abrasive window cleaners on the interior
surface of the window.
Keep all objects a safe distance from the

window.
Temperature Control
Temperature Control regulates the temperature
of the air forced through the climate system.
The temperature increases as you
turn the temperature control knob
clockwise.
GETTING TO KNOW YOUR VEHICLE
The temperature decreases as you
turn the temperature control knob
counterclockwise.
Blower Control
Blower Control regulates the amount
of air forced through the climate
control system. There are seven
blower speeds available. The blower
speed increases as you turn the blower control
knob clockwise from the lowest blower setting.
The blower speed decreases as you turn the
blower control knob counterclockwise.
Mode Control
Turn the mode control knob to adjust
airflow distribution. The airflow
distribution mode can be adjusted so
air comes from the instrument panel
outlets, floor outlets, defrost outlets and demist
outlets.
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