RAM PROMASTER CITY2018, Owner'S Manual

Page: 56 / 347

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 provide proper corrosion
protection and to protect against engine overheating. OAT
coolant (conforming to MS.90032) is recommended. Refer
to “Fluids and Lubricants” in “Technical Specifications” for
proper coolant selection.
Winter Operation
To ensure the best possible heater and defroster perfor-
mance, make sure the engine cooling system is functioning
properly and the proper amount, type, and concentration
of coolant is used. Refer to “Dealer Service” in “Servicing
And Maintenance” for proper coolant selection. Use of the
air recirculation mode during Winter months is not recom-
mended 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 condi-
tioning 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 compres-
sor 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. Windows may frost on
the inside of the glass in very cold 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.
54 GETTING TO KNOW YOUR VEHICLE