MICRO - BIRD
19
1.
Adequate engine (coolant) temperature — this can be altered
by thermostat rating, which should never be higher than re-
commended by the engine manufacturer, and/or shutters.
2.
Adequate coolant flow — this varies with engine speed and
can be increased if necessary by the use of an auxiliary water
pump. The heaters are rated at six gallons per minute.
3.
Proper fan operation — all motors are two speed and can most
easily be checked for function by operating the motor switches
individually and listening for the speed variations.
Many other factors affect performance, but the three mentioned
are most basic.
HEATER OPERATION
Be sure the engine radiator is full and all coolant flow valves
are open. For your own safety, do not leave the engine running
while opening or closing valves.
Warm up the engine to operat-
ing temperature with the engine at fast idle, if possible, and turn on
the heater fans and the auxiliary water pump if unit is equipped
with one. Under extremely cold weather conditions, turning on
the heater fans will cause the engine temperature to drop notice-
ably as heat from the engine is being transferred into the body, but
as air temperature inside the body rises, engine temperature also
rises. More heat will also be generated by the engine when it is
caused to work in moving the vehicle. Once the engine is warm,
heater fan motor speeds and subsequent air volumes across heater
cores can be controlled at the discretion of the driver for best
defrosting and ultimate passenger comfort.
*Note:
See Heater Bleeding Instructions for completely filling
cooling system.
Содержание Micro Bird
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Страница 43: ...Part Number 1974559 Blue Bird Corporation P O Box 937 Fort Valley GA 31030...