OPERATION UNDER UNUSUAL CONDITIONS - CONTINUED
OPERATE IN EXTREME COLD - CONTINUED
Operate Arctic Heater To Heat Cab (if equipped).
Arctic heater is used to provide engine preheating for engine startup in
extreme cold. It is also used to provide personnel heat. When heater is
required to preheat engine coolant and engine block before startup, it
should be turned on 1/2-1 hour before engine is started.
Auxiliary heater (AUX HTR) indicator light illuminates only when
burner is lit. Indicator light turns on and off automatically.
During auxiliary heater operation, watch battery indicator. If necessary,
start engine to charge batteries.
Place master battery switch to ON.
Turn all electrical equipment in cab OFF (i.e., heated mirrors, defroster blower, per-
sonnel heater blower, etc.).
Push auxiliary heater coolant flow control knob OUT (located on the radio support
Place heater mode control lever (3) to HEAT.
Turn ignition switch to the accessory position (counterclockwise).
Place AUX HTR switch (2) in ON position. Green light in switch will illuminate.
AUX HTR light (1) will light when combustion starts after approximately 50 sec-
If HI-LO switch is set to HI position, heater will automatically switch to low
heat when temperature of coolant at heater inlet reaches 176°F (80°C). LO
position is suitable when heater operates over an extended period.
Place HI-LO switch (4) to desired setting.
To turn auxiliary heater off, place AUX HTR switch (2) to OFF position. Heater
burner will stop and AUX HTR light will go out within a few minutes. Blower will
continue to run for approximately 90 seconds.
OPERATE IN EXTREME HEAT
General. During very hot weather, driving procedures may require altering to prevent
vehicle overheating. Avoid continuous high speeds, long, hard pulls, and continuous
operation in soft terrain.