Buick LaCrosse Owner's Manual page 283

The engine coolant temperature
warning light comes on the
instrument panel, to indicate the
vehicle has entered overheated
engine protection operating mode.
The temperature gauge also
indicates an overheat condition
exists. Driving extended distances
and/or towing a trailer in the
overheat protection mode should be
avoided.
The vehicle has electric power
steering and does not use power
steering fluid.
See
for information on the
location of the power steering fluid
reservoir.
It is not necessary to regularly
check power steering fluid unless a
leak is suspected in the system or
an unusual noise is heard. A fluid
loss in this system could indicate a
problem. Have the system inspected
and repaired.
Check the level when the engine
is cool.
To check the power steering fluid:
1. Wipe the cap and the top of the
reservoir clean.
2. Unscrew the cap and pull it
straight up.
3. Wipe the dipstick with a
clean rag.
4. Replace the cap and completely
tighten it.
5. Remove the cap again and look
at the fluid level on the dipstick.