Navistar ProStar+ Operation And Maintenance Manual page 106

Controls / Features
To remove stale air or smoke while air conditioner is operating, you may want to open a vent window for a short period of time. Always park in
the shade when possible. If your vehicle has been parked in the sun with the windows up, remove the overheated air inside by driving with
windows down and the air conditioner ON for one or two city blocks.
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Mix Mode
In this mode 50% of the airflow is directed to the defrost and side de-mist air outlets and 50% of
the airflow is directed to the floor air outlets, while fresh (outside) air is circulated inside the vehicle.
The A/C compressor turns on and off automatically as needed when in this mode to reduce
humidity levels and help reduce moisture buildup on the windshield.
Defrost
In this mode all of the airflow is directed to the defrost and side de-mist air outlets, and fresh
(outside) air is circulated inside the vehicle.
The A/C compressor turns on and off automatically as needed when in this mode to reduce
humidity levels and help reduce moisture buildup on the windshield.