User Manual - Page 35

For RAM 2021 PROMASTER CITY.

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GETTING TO KNOW YOUR VEHICLE 33
Bi-Level Mode
Air comes from the instrument panel
outlets and floor outlets. A slight
amount of air is directed through the
defrost and side window demister
outlets.
NOTE:
Bi-Level mode is designed under comfort condi-
tions to provide cooler air out of the panel
outlets and warmer air from the floor outlets.
Floor Mode
Air comes from the floor outlets. A
slight amount of air is directed
through the defrost and side window
demister outlets.
Mix Mode
Air is directed through the floor,
defrost, and side window demister
outlets. This setting works best in cold
or snowy conditions that require extra
heat to the windshield. This setting is good for
maintaining comfort while reducing moisture on
the windshield.
Operating Tips
NOTE:
Refer to the chart at the end of this section for
suggested control settings for various weather
conditions.
Summer Operation
The engine cooling system must be protected
with a high-quality antifreeze coolant to provide
proper corrosion protection and to protect
against engine overheating. OAT coolant
(conforming to MS.90032) is recommended
Ú page 259.
Winter Operation
To ensure the best possible heater and
defroster performance, make sure the engine
cooling system is functioning properly and the
proper amount, type, and concentration of
coolant is used Ú page 259. 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 fresh air with the blower setting
on high. This will ensure adequate system
lubrication to minimize the possibility of
compressor damage when the system is started
again.
Window Fogging
Vehicle windows tend to fog on the inside of the
glass in mild, rainy and/or humid weather. To
clear the windows, select Defrost or Mix mode
and increase the front blower speed. Do not use
the Recirculation mode without A/C for long
periods, as fogging may occur.
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21_VM_OM_EN_USC_t.book Page 33
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