Chevrolet 4500HD Series 2019 Manual page 135

134 Climate Controls
Turn the temperature control knob
fully towards the low-temperature
direction. Set the fan speed control
knob to the maximum speed
position.
After prolonged parking in direct
sunlight, open the windows or doors
to ventilate the interior of the cab
and release the heat.
During cooling operation, mist may
come out of the air outlets. This
results from quick cooling of humid
air, and does not indicate any
problem.
After maximum cooling, be certain
to return the air selector lever to the
position. Failure to do so will
cause the windshield to fog up,
impeding forward visibility.
Air Vents
1. Driver Side Outlets. Airflow
direction is adjustable.
2. Windshield Outlets. Air is
delivered towards the
windshield.
3. Passenger Side Outlets.
Airflow direction is
adjustable.
4. Door Windows Outlet. Air is
delivered towards the door
windows
5. Foot Outlets. Air is delivered
towards the feet.