Navistar WorkStar Series, Operator'S Manual

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Controls/Features
Mix Mode
In this mode 50 percent of the airflow is directed to the defrost and side demist air outlets and
50 percent of the airflow is directed to the floor 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.
Defrost
In this mode, all of the airflow is directed to the defrost and side demist 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.
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.
Air Conditioning
CAUTION
Failure to follow recommended service
procedures and maintain adequate air flow
through
air exchange devices may result
in component failure. Cleaning should be
performed by a qualified technician.
Keep radiator area free of bugs, leaves, etc. Do not cover the
condenser with a wire screen.
At least once or twice a month, turn ON the air conditioner for a
few minutes while the engine is running. This periodic operation
keeps all the mechanical parts of your air conditioner in good
operating condition.
It is normal for small amounts of water to drain out of the air
conditioner module. This water is condensed moisture removed
from the air inside the vehicle.
Correct airflow may be restored by either replacing the filter(s),
which can be done without tools, or by cleaning the filters. The
filter(s) may be cleaned by using a power washer with a soap
solution. Keep the spray head at least six inches away from the
filter to avoid damage. Rinse thoroughly.
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