Pontiac 1996 Grand Am Owner's Manual page 72

Engine Coolant Heater (Option)
2.4L Engine
c
c
I RI
3.1L Engine
In very cold weather, 0°F
(-
18°C) or colder, the engine
coolant heater can help. You'll get easier starting
and
better fuel economy during engine warm-up. Usually,
the coolant heater should be plugged in a minimum of
four hours prior to starting your vehicle.
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