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Heating and Air Conditioning 177
Cab Ventilation
Ventilation Guidelines
If at any time there is any doubt that ex-
haust fumes are entering the cab, have the
cause of the fumes determined and cor-
rected as soon as possible. If the vehicle
must be driven under these conditions,
drive only with all windows open.
Protect against carbon monoxide entry into
the cab. Keep the engine exhaust system,
cab and cab ventilation system properly
maintained. It is recommended that the ex-
haust system and cab are inspected by a
competent technician:
•
At every engine oil change.
•
Whenever a change is noticed in the
sound of the exhaust system.
•
Whenever the exhaust system, under-
body or cab is damaged.
Do not breathe the engine exhaust gas. It
contains carbon monoxide, which has no
color or odor. Carbon monoxide is a
dangerous gas which can cause uncon-
sciousness or death.
Diesel engine exhaust and some of its
constituents are known to the state of
California to cause cancer, birth defects
or other reproductive harm.
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.
Do not park the vehicle and let the engine
run or idle for more than 10 minutes with
the ventilation system control switch in the
off position. Even with the ventilation sys-
tem on, running the engine while parked or
stopped for long periods of time is not rec-
ommended. Entry of carbon monoxide into
the cab is possible with a poorly repaired,
damaged or corroded exhaust system or cab.
Do not run the engine in confined areas,
such as garages or next to a building, any
more than necessary. The area must be
properly ventilated. When the vehicle must
be stopped with the engine running for
more than a few minutes:
•
Adjust the heating or cooling system
to force outside air into the cab. Do
this by setting the fan to medium or
high speed and with the controls set in
any position except for recirculation of
air inside of the cab.
•
Keep the exhaust pipe area clear to
help reduce the buildup of exhaust gas
under the vehicle.