Navistar WorkStar Series, Operator'S Manual

Page: 95 / 258

Controls/Features
NOTE: If your air conditioning performance seems lower
than expected, check the front of the A/C condenser for an
accumulation of dirt or insects. Clean with a gentle water spray
from behind the radiator and through the condenser as required.
Check for dirt and debris in both the cab and sleeper HVAC
intake filters that may reduce airflow.
NOTE: The air conditioning system incorporates a low-pressure
switch, which disengages the compressor clutch if evaporator
outlet pressure falls below a certain set point. To restart the air
conditioning system after an automatic shutdown has occurred,
the operator must do one of the following:
1. Set A/C control to OFF and then back to ON. Fan speed
control knob MUST NOT be in the OFF position.
2. Place fan speed control knob in OFF position and then
back to the desired speed setting. A/C system must be
ON.
NOTE: If the system continues to shut down automatically, have
the system checked.
NOTE: The vehicle may be equipped with optional Heater Shut
Off Valve(s) to prevent hot coolant from circulating through the
heater core(s). Closing the valve(s) during hot weather operation
will improve A/C system performance. If the valves are shut OFF,
in-cab temperature adjustment may become limited. In addition,
when shut off valves are closed defrosters will only produce cold
air.
Dehumidification
The heater/defroster systems can be operated simultaneously
with the air conditioner during mild weather and high humidity
conditions to dehumidify the cab air. Turn the mode button to
one of the A/C positions and position the temperature knob at
a comfortable temperature location.
The air conditioner will
remove the humidity while the heater keeps the cab comfortable.
Door and Window Controls
Door Lock/Unlock
Cab Doors and Locks
The cab doors can be unlocked with the same key used for the
ignition lock. There is also a keyless remote entry available.
NOTE: The vehicle is delivered with two identical keys. If
more keys are needed, order them through your authorized
International dealer.
Record the key code and keep it in a
secure place. A new key can be made if the keys are lost.
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