Oldsmobile 2002 Alero - Manual (Page 86)

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Engine Coolant Heater (Option)
2.2L L4 ECOTEC
t Engine
3400 V6 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. At temperatures above 32
_F (0_C),
use of the coolant heater is not required.