Power Steering Fluid

See Engine Compartment Overview for the location of the power steering fluid reservoir.
When to Check Power Steering Fluid
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.
How to Check Power Steering Fluid
Notice: Extremely small amounts of contamination can cause steering system damage and cause it to not work properly.
Do not allow contaminants to contact the fluid side of the reservoir cap/dipstick or to enter the reservoir.
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.
What to Use
To determine what kind of fluid to use, see Recommended Fluids and Lubricants.
Always use the proper fluid.
Test yourself
A quick Cadillac CTS quiz: every answer comes with an explanation and a link to the manual page.