Buick 2010 Lacrosse Owner's Manual page 304

The vehicle has several indicators
to warn of engine overheating.
There is a coolant temperature
gauge and a warning light on the
instrument panel cluster that
indicate an overheated engine
condition. See
for more information.
You may decide not to lift the hood
when this warning appears, but
instead get service help right away.
See
.
If you do decide to lift the hood,
make sure the vehicle is parked on
a level surface.
Then check to see if the engine
cooling fans are running. If the
engine is overheating, the fan(s)
should be running. If they are not,
do not continue to run the engine
and have the vehicle serviced.
See
information on driving to a safe
place in an emergency.
If an engine overheat warning is
displayed but no steam can be seen
or heard, the problem might not be
too serious. Sometimes the engine
can get a little too hot when the
vehicle:
Climbing a long hill on a hot day.
Stopping after high-speed
driving.
Idling for long periods in traffic.
Towing a trailer.
for