FORD F-250 - Manual (Page 107)

Using the engine block heater (if equipped)
An engine block heater warms the
engine coolant, which improves
starting, warms up the engine faster
and allows the heater-defroster
system to respond quickly. Use of an
engine block heater is strongly
recommended if you live in a region
where temperatures reach -23°C
(-10°F) or below.
For best results, plug the heater in
at least three hours before starting
the vehicle. Using the heater for
longer than three hours will not harm the engine, so the heater can be
plugged in the night before starting the vehicle.
To prevent electrical shock, do not use your heater with
ungrounded electrical systems or two-pronged (cheater)
adapters.
Guarding against exhaust fumes
Although odorless and colorless, carbon monoxide is present in exhaust
fumes. Take precautions to avoid its dangerous effects.
If you ever smell exhaust fumes of any kind inside your vehicle,
have your dealer inspect and fix your vehicle immediately. Do
not drive if you smell exhaust fumes. These fumes are harmful and
could kill you.
Have the exhaust and body ventilation systems checked whenever:
• the vehicle is raised for service.
• the sound of the exhaust system changes.
• the vehicle has been damaged in a collision.
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