Buick 1997 Riviera - Engine Coolant Heater (Option)

Engine Coolant Heater (Option)
In very cold weather, 0°F (- 18 O 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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