Oldsmobile 1999 Alero - Manual (Page 80)

yellow blue
2-20
Engine Coolant Heater (If Equipped)
2.4L L4 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.