Chrysler 2010 PT Cruiser - Owner Manual - Manual (Page 187)

Window Fogging
Vehicle side windows tend to fog on the inside in mild,
rainy or humid weather. To clear the windows, use the
A/C, Panel and Blower controls. Direct the panel outlets
toward the side windows. Do not use recirculate without
A/C for long periods, as fogging may occur.
Interior fogging on the windshield can be quickly re-
moved by using the defrost position.
If the fogging problem persists, clean the inside window
surfaces. The cause of undue fogging may be dirt collect-
ing on the inside surface of the glass.
NOTE: In cold weather, the use of the recirculate
position will cause windows to fog on the inside because
of moisture buildup inside the vehicle. For maximum
defogging, use the Outside Air position.
Summer Operation
Vehicles must be protected with a high-quality antifreeze
coolant to provide proper corrosion protection and to
raise the boiling point of the coolant for protection
against
overheating. A 50% concentration is
recommended.
Outside Air Intake
When operating the system, make sure the air intake,
directly in front of the windshield, is free of ice, slush,
snow or other obstructions such as leaves. Leaves col-
lected in the air-intake plenum may reduce airflow and
plug the plenum water drains.
The blower air will heat faster in cold weather if you use
only a low blower speed for the first few minutes of
vehicle operation.
186 UNDERSTANDING YOUR INSTRUMENT PANEL