Chevrolet 2011 HHR Owner's Manual page 326

See Engine Compartment Overview on page 6 14
for more information on the location of the
positive (+) and negative ( ) terminals on the
vehicle.
WARNING:
An electric fan can start up even when the engine
is not running and can injure you. Keep hands,
clothing and tools away from any underhood
electric fan.
6-38
Locate the remote
negative ( ) ground
terminal, marked GND ( ),
which is located at the
front of the engine
compartment on the
driver side of the vehicle.
I n f o r ma t i o n P r o v i d e d b y :
WARNING:
Using a match near a battery can cause battery
gas to explode. People have been hurt doing this,
and some have been blinded. Use a flashlight if
you need more light.
Be sure the battery has enough water. You do not
need to add water to the battery installed in your
new vehicle. But if a battery has filler caps, be
sure the right amount of fluid is there. If it is low,
add water to take care of that first. If you don't,
explosive gas could be present.
Battery fluid contains acid that can burn you. Do
not get it on you. If you accidentally get it in your
eyes or on your skin, flush the place with water
and get medical help immediately.