Operating Tips - RAM Commercial Promaster 2018 User Manual

Recirculation
When outside air contains smoke, odors, or
high humidity, or if rapid cooling is desired,
you may wish to recirculate interior air by
pressing the recirculation control button. The
recirculation indicator will illuminate when
this button is selected. Press the button a
second time to turn off the Recirculation
mode and allow outside air into the vehicle.
NOTE:
In cold weather, use of recirculation mode
may lead to excessive window fogging. On
systems with Manual Climate Controls, the
recirculation mode is not allowed in Defrost
mode to improve window clearing operation.
Recirculation will be disabled automatically
if this mode is selected. Attempting to use
recirculation while in this mode will cause
the LED in the control button to blink and
then turn off.

Operating Tips

Summer Operation
The engine cooling system must be protected
with a high-quality antifreeze coolant to pro-
vide proper corrosion protection and to pro-
tect against engine overheating. A solution of
50% OAT (Organic Additive Technology) cool-
ant that meets the requirements of FCA Ma-
terial Standard MS.90032 and 50% water is
recommended. Refer to "Dealer Service" in
"Servicing And Maintenance" in your Own-
er's Manual for proper coolant selection.
Winter Operation
Use of the air Recirculation mode during
winter months is not recommended because
it may cause window fogging.
Vacation Storage
Any time you store your vehicle or keep it out
of service (i.e., vacation) for two weeks or
more, run the air conditioning system at idle
for about five minutes in the fresh air and
high blower setting. This will ensure ad-
equate system lubrication to minimize the
possibility of compressor damage when the
system is started again.
Window Fogging
Interior fogging on the windshield can be
quickly removed by turning the mode selector
to Defrost. The Defrost/Floor mode can be
used to maintain a clear windshield and pro-
vide sufficient heating. If side window fog-
ging becomes a problem increase blower
speed. Vehicle windows tend to fog on the
inside in mild but rainy or humid weather.
NOTE:
Recirculate without A/C should not be used
for long periods, as fogging may occur.
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
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