PART 4: CONTROLS AND DISPLAYS
PB1319 (CAT. NO. 5296 ) —32— 22-01691 (R02/02)
Heating System
The heating system is a variable-coolant-flow type of system.
• Hot engine coolant is circulated by the engine water pump through
a heater core within the heater unit.
• Two blowers force air through the core and into the cab.
The amount of heat is controlled by
• the position of the modulating water valve that regulates hot
engine coolant flow
• the choice of fresh air or recirculated cab interior air as feed air to
the blowers
NOTE: Keep the engine exhaust system and the vehicle’s ventila-
tion system properly maintained. It is recommended that the vehi-
cle’s exhaust system and cab be inspected
•
By a competent technician every 15,000 miles
•
When a change is noticed in the sound of the exhaust system
•
If the exhaust system, underbody, or cab is damaged
NOTE: To allow for proper operation of the vehicle ventilation
system, keep the inlet grille at the base of the windshield clear
of snow, ice, leaves and other obstructions at all times.
NOTE: Do not stay in the vehicle with the engine running or
idling for more than 10 minutes with the vehicle’s Heater / AC
ventilation system in RECIRC or at LOW FAN SPEED. Even
with the ventilation system On, running the engine while parked
or stopped for prolonged periods of time is not recommended.
NOTE: If you are required to idle your vehicle for long periods of
time, install an auxiliary heater or automatic idle control. These auxil-
iary devices can reduce fuel consumption and save you money.
NOTE: When idling for short periods of time
•
Set the heating or cooling system to Heat or A/C
•
Set the fan to Medium or High speed
•
Set the controls to FRESH AIR
NOTE: If other vehicles are parked next to you idling, move
your vehicle or do not stay in your vehicle for prolonged peri-
ods of time.
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