Pontiac 2004 Grand Am - Manual (Page 90)

Engine Coolant Heater
Your vehicle may have this feature. In very cold
weather, 0°F (
−
18°C) or colder, the engine coolant
heater can provide 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.
2.2L L4 ECOTEC™ Engine
3400 V6 Engine
2-22