Essential Tools:
* Jack and Jack Stands: Absolutely crucial for safety. Never work under a vehicle supported only by a jack.
* Wheel Chocks: To prevent the vehicle from rolling.
* Lug Wrench: To remove the wheels.
* Socket Set (Metric): You'll need various sizes, including likely a 15mm, 18mm and possibly a 22mm, depending on the specific nut sizes on your vehicle. Check a repair manual for specifics.
* Wrench Set (Metric): To help break loose stubborn bolts if sockets slip.
* Idler Arm Puller: This specialized tool is essential to remove the old idler arm from the steering linkage. A ball joint separator *might* work in a pinch, but an idler arm puller is designed for the job and less likely to damage components.
* Torque Wrench: To tighten the new idler arm to the manufacturer's specifications (found in a repair manual). This is crucial for proper steering and alignment.
* Penetrating Oil (PB Blaster or similar): Soaking the nuts and bolts beforehand will significantly help in loosening them.
* Hammer: Possibly needed to help the idler arm puller.
* Pry Bar: Might be helpful for maneuvering components.
Recommended Tools:
* Repair Manual (specifically for your 1999 S10 Blazer): This will provide diagrams, torque specifications, and step-by-step instructions. Investing in a Haynes or Chilton manual is highly recommended.
* Safety Glasses: Protect your eyes from flying debris.
* Gloves: Protect your hands.
* Ratchet: Makes socket work much easier. A breaker bar might also be needed for stubborn fasteners.
Important Notes:
* Disconnect the battery negative terminal before beginning any work on the steering system.
* Always support the vehicle properly using jack stands. Never rely solely on a jack.
* Consult a repair manual before starting the job. Improper installation can lead to dangerous steering problems.
* The specific socket and wrench sizes might vary slightly depending on your Blazer's trim and options. Refer to your repair manual for precise details.
Replacing an idler arm isn't a particularly difficult job, but it requires some mechanical aptitude and the right tools. If you're not comfortable working on your vehicle, it's best to take it to a qualified mechanic.
