Climate Controls
Heater Booster Pump
The optional heater booster pump assists coolant flow from
the engine and increases heater performance. Turn the heater
booster pump ON to provide the vehicle with additional interior
heat.
NOTE: Do not use the heater booster pump unless the
heater cut-off valve is manually opened.
Heater Cut-Off Valve
NOTE: The illustration is for reference only and may differ
from the actual vehicle.
Typical Heater Cut-Off Valve
The heater cut-off valve for the coolant supply is under the hood.
Turn the heater cut-off valves ON (counterclockwise) whenever
the heater is used.
Turn the heater cut-off valves OFF (clockwise) to stop hot coolant
from being routed into the bus on hot days.
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