Chevrolet Impala Owner's Manual page 231

Shifting out of D (Drive) to any
other gear.
The air conditioning or defrost
system need the compressor to
maintain vehicle comfort. See
The warmer
it is outside, the shorter the time
before the engine is restarted to
provide cabin cooling. To
maximize fuel economy, use the
eco air conditioning mode.
The climate control system is
turned from off to normal air
conditioning or defrost. See
.
The engine is required to run for
either heater or climate control
performance. See
.
The high voltage battery pack
charge is low and requires
recharging.
Auto stop time is greater than
two minutes.
The hood is opened.
Engine Heater
The engine coolant heater,
if equipped, can help in cold
weather conditions at or below
18°C (0°F) for easier starting and
better fuel economy during engine
warm-up. Plug in the coolant heater
at least four hours before starting
the vehicle. An internal thermostat
in the plug end of the cord will
prevent engine coolant heater
operation at temperatures above
18°C (0°F).
To Use the Engine Coolant
Heater
1. Turn off the engine.
2. Open the hood and unwrap the
electrical cord. The electrical
cord is on the driver side of the
engine compartment, between
the fender and the engine
compartment fuse block.
3. Plug it into a normal, grounded
110-volt AC outlet.
Driving and Operating
Warning
Plugging the cord into an
ungrounded outlet could cause an
electrical shock. Also, the wrong
kind of extension cord could
overheat and cause a fire. You
could be seriously injured. Plug
the cord into a properly grounded
three-prong 110-volt AC outlet.
If the cord will not reach, use a
heavy-duty three-prong extension
cord rated for at least 15 amps.
4. Before starting the engine, be
sure to unplug and store the
cord as it was before to keep it
away from moving engine parts.
The length of time the heater should
remain plugged in depends on
several factors. Ask a dealer in the
area where you will be parking the
vehicle for the best advice on this.
9-23