ELECTRIC SYSTEM 5540F/YB5515 SERVICE MANUAL
3-16 Published 10-21-2010, Control# 198-04
Heater
The heater is a hot water heater and is connected into the
cooling system of the engine. An electric blower pushes air
through the heater core and into the cab. A defroster fan
blows air onto the windshield.
See the electrical wiring diagrams in Schematics/Wiring
Diagrams. Power is available through a 15 amp fuse to the
heater/defroster switch in the instrument panel when the
ignition switch is in the ON position. The switch is a three
position switch (HI, LO and OFF).
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