Ford 1996 Windstar Manual page 63

Do not park, idle, or drive your vehicle in dry grass or
other dry ground cover. The emission system heats up
the engine compartment and exhaust system, which can
start a fire.
Using the Engine Block Heater (If equipped)
(Standard in Canada)
Using your engine block heater is strongly recommended if you
live in a region where temperatures consistently reach
( 29˚C) or below during the winter months. An engine block
heater warms the engine coolant which improves starting,
warms up the engine faster, and allows the heater-defrost
system to respond more quickly.
To prevent electrical shock, do not use your heater with
ungrounded electrical systems or two-pronged (cheater)
adapters.
For best results, plug the heater in at least three hours before
you start your vehicle. Using the heater for longer than three
hours will not damage the engine, so you can leave it plugged
in all night to start your vehicle the following morning.
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