1. Gather Your Supplies:
* New power steering fluid: Use the type specified in your owner's manual. Dexron III ATF is commonly used, but check your manual to be sure. Get enough to completely flush the system.
* Funnel: A flexible funnel will make filling easier.
* Wrench: The size will depend on your Suburban's power steering fluid reservoir drain plug and possibly the return line fitting if you're doing a complete flush (see below).
* Drain pan: To catch the old fluid.
* Jack and jack stands (optional but recommended): Makes access much easier.
* Gloves: To protect your hands from the old fluid.
* Rags or shop towels: To clean up spills.
* Clear tubing (optional): For a more complete flush (see below).
2. Prepare the Vehicle:
* Park on a level surface, engage the parking brake, and turn off the engine. If using a jack, jack up the front end and securely support it with jack stands.
3. Locate the Power Steering Fluid Reservoir:
* The reservoir is usually located under the hood, often near the power steering pump. Consult your owner's manual for the exact location.
4. Drain the Old Fluid (Partial Flush):
* This is the simplest method, but less effective at removing all the old fluid.
* Locate the drain plug (if equipped; some models don't have one).
* Place the drain pan under the drain plug.
* Carefully remove the drain plug and let the fluid drain completely.
* Replace the drain plug once drained.
5. Drain and Flush (More Thorough):
* This method is more involved but cleans the system more thoroughly. It involves disconnecting a return line. *Proceed with caution, as fluid under pressure can be dangerous.*
* (Optional but recommended): Consult a repair manual specific to your 1999 Chevy Suburban. It will show you exactly which return line to disconnect (usually near the pump or reservoir).
* With the engine OFF, carefully disconnect the return line. Have the drain pan ready. Some fluid may come out.
* Have a helper turn the steering wheel lock-to-lock several times while you watch the old fluid flow out. This helps push out the contaminated fluid.
* Reconnect the return line once the flow significantly slows.
6. Fill the Reservoir:
* With the engine OFF, add new power steering fluid to the reservoir, using the funnel, to the "full" line.
7. Bleed the System (If Necessary):
* With the engine OFF, start the engine and turn the steering wheel slowly lock-to-lock several times. Check the fluid level and add more if needed. Repeat this process until the fluid level remains stable.
8. Check for Leaks:
* Once finished, carefully inspect all connections and hoses for leaks.
9. Test Drive:
* Take the Suburban for a short test drive to ensure the power steering operates correctly.
Important Considerations:
* Fluid Type: Always use the correct type of power steering fluid recommended in your owner's manual. Using the wrong fluid can damage the power steering system.
* Safety: Be cautious when working under the hood. The engine and other components can be hot, and the power steering system contains pressurized fluid.
* Complete Flush (Using Clear Tubing): For a truly complete flush, you can use clear tubing to connect the return line to a container and run the engine to pump out the old fluid, constantly adding fresh fluid to the reservoir until the fluid emerging is clean. This is more advanced and requires patience.
If you are uncomfortable performing this task yourself, it's always best to take your Suburban to a qualified mechanic. They have the tools and experience to do the job safely and correctly.
