Engine brake Switch:
This switch activates the control solenoid for the engine brake
system.
Engine Heat (Optional):
The engine preheat loop is an integral part of the Aqua-Hot heat-
ing system. In cold ambient temperatures, use this feature to
preheat the engine. The Aqua-Hot will also supply supplemen-
tal heating to the interior using the heat created by the engine.
While traveling, the water pump on the engine coolant will
pass through the Aqua-Hot. When using the supplemental heat-
ing feature, use the Comfort Control thermostat to activate the
desired heat exchangers.
To Enable Engine Preheat:
• Turn Aqua-Hot switch on.
• Turn the engine heat switch ON. This activates the engine pre-
heat circulation pump. Circulating the engine’s coolant through
the engine pre-heat loop will adequately warm the engine to
operate for easy starting.
• Allow approximately one to two hours (longer for colder, ambi-
ent temperatures) of engine preheating run time. The pump can
be operated overnight if desired.
• Turn the engine heat switch OFF when engine preheating is not
desired.
NOTE: Layouts may vary with difference in models and options.
Fans HI/LO:
Operates the driver’s two speed dash fan for use with wind-
shield defrosting and cooling.
Fans HI/LO:
Operates the passenger’s two speed dash fan for use with
windshield defrosting and cooling.
Electrical Systems - Chassis
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S I G N A T U R E
9 • 2 4 2
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