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is plainly marked for open or closed and may be placed in any
intermediate position to regulate the amount of air coming
from the registers.
DEFROST KNOB
Windshield defrosting and defogging is controlled by
operating the knob labeled DEFROST.
When the knob is turned
to OPEN, the air flows from the defroster outlets at the base
of the windshield.
When the knob is turned to CLOSED, air-
flow to the defroster outlets is shut off.
The knob may be
set in any intermediate position to regulate the defroster
airflow.
HEATER OVERHEAT WARNING LIGHT
An amber overheat warning light is provided and is
labeled HEATER OVERHEAT.
When illuminated, the light indi-
cates that the heater overheat switch has been actuated and
that the temperature of the air in the heater has exceeded
325°F.
Once the heater overheat ·switch has been actuated,
the heater turns off and cannot be restarted until the over-
heat switch, located in the right forward nose compartment,
has been reset.
Prior to having the overheat switch reset,
the heater should be thoroughly checked to determine the
reason for the malfunction.
HEATER OPERATION FOR HEATING AND DEFROSTING
(1)
Battery Switch - ON.
(2)
Cabin Air Knob - OPEN.
(3)
Defrost Knob - Adjust as desired (if defrosting is
desired).
(4)
Temperature Control Knob - OPEN.
(5)
Cabin Heat Switch - HEAT.
(6)
Heat Registers - As Desired.
Cabin heated air temperature may be increased during
operation in extremely cold weather by manually adjusting the
defrost, forward cabin and aft cabin air controls to reduce
total airflow into the cabin.
2-32
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