Cadillac 2012 CTS Owner's Manual page 337

It is not necessary to regularly
check power steering fluid unless
you suspect there is a leak in the
system or you hear an unusual
noise. A fluid loss in this system
could indicate a problem. Have the
system inspected and repaired.
To check the power steering fluid:
1. Turn the key off and let the
engine compartment cool down.
2. Wipe the cap and the top of the
reservoir clean.
3. Unscrew the cap and 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.
The level should be between the
HOT and COLD marks. If necessary,
add only enough fluid to bring the
level between the marks.
To determine what kind of fluid to
use, see
use the proper fluid.
When adding windshield washer
fluid to the vehicle, be sure to read
the manufacturer's instructions
before use. If you will be operating
your vehicle in an area where the
temperature may fall below freezing,
use a fluid that has sufficient
protection against freezing.
. Always