Volvo VNL 780 Operator's Manual page 354

344 OPERATION
Engine Block Heater (Optional)
An electric engine block heater can be installed for keeping the coolant hot when the vehicle
is parked. The heater is mounted through the side of the engine block with the heater
coils in the coolant jacket. The heater does not interfere with normal operation and can
be permanently installed.
The heater runs on 120 V and has an easily accessible plug, located beside the driver side
door. The plug will hook up to a normal extension cable.
Note: Location of the block heater depends on vehicle model.
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