2005 Cadillac STS Owner's Manual - Page 323

5. Then replace the pressure cap. Be sure the pressure cap is hand-tight and fully seated. Start the engine and allow it to warm up. If the Check Coolant Level message does not appear on the Driver Information Center, the coolant is at the proper fill level. If a Check Coolant Level message does appear, repeat Steps 1 to 3 then reinstall the pressure cap, or see your GM dealer. 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 To check the power steering fluid, do the following: 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 within the HOT mark. If necessary, add only enough fluid to bring the level within the mark. Power Steering Fluid The power steering fluid reservoir is located in the center of the engine compartment, toward the front of the vehicle. See Engine Compartment Overview on page 5-12 for more information on location. What to Use To determine what kind of fluid to use, see Recommended Fluids and Lubricants on page 6-12. Always use the proper fluid. Failure to use the proper fluid can cause leaks and damage hoses and seals. 5-33