Tools You'll Need:
* Jack and jack stands: Essential for safely lifting the vehicle.
* Wheel chocks: To prevent the vehicle from rolling.
* Socket wrench set: Including metric sockets (sizes will vary depending on your specific Blazer).
* Wrench set: Both metric and standard sizes might be needed.
* Pry bar: To help separate components.
* Hammer: Possibly needed to break loose stubborn bolts.
* Penetrating oil (like PB Blaster): To loosen rusted or seized bolts. Apply liberally and let it sit for a while.
* New idler arm: Make sure you get the correct replacement part for your specific Blazer model.
* Torque wrench: To tighten bolts to the correct specifications.
* Alignment tool (optional but highly recommended): After replacing the idler arm, a wheel alignment is crucial.
Steps:
1. Safety First: Park on a level surface, engage the parking brake, and chock the wheels. Raise the front of the vehicle using the jack and securely support it with jack stands.
2. Disconnect the Battery: This prevents accidental shorts and protects your electrical system.
3. Remove the Old Idler Arm:
* Locate the idler arm: It's usually located on the passenger side of the vehicle near the steering linkage.
* Disconnect the steering linkage: This will involve removing a cotter pin and nut securing the connection. Mark the position of the linkage to ensure proper reassembly.
* Disconnect the idler arm mounting bolts: These bolts connect the arm to the frame. They are typically difficult to remove, so apply penetrating oil generously and allow ample time for it to work. You might need to use a breaker bar or impact wrench.
* Remove the idler arm: Once the bolts are loosened, carefully remove the idler arm. This might require some leverage with a pry bar.
4. Install the New Idler Arm:
* Install the new idler arm: Line it up with its mounting points and carefully bolt it into place.
* Reconnect the steering linkage: Make sure you connect it to the same position you marked earlier.
* Tighten all bolts: Tighten the bolts to the manufacturer's specified torque. Use a torque wrench to ensure they are tightened correctly.
5. Lower the Vehicle: Carefully lower the vehicle to the ground using the jack.
6. Check for Leaks: Inspect the area for any fluid leaks.
7. Test Steering: Start the engine and carefully turn the steering wheel from lock to lock. Listen for any unusual noises or binding.
8. Wheel Alignment: This is absolutely critical. After replacing the idler arm, you must get a wheel alignment performed by a professional. Improper alignment can lead to tire wear and handling problems.
Important Notes:
* This process might vary slightly depending on your specific Blazer model. Always refer to a repair manual specific to your vehicle.
* If you are not comfortable performing this repair yourself, it's best to take your Blazer to a qualified mechanic. Improper installation can lead to serious steering problems.
* Take pictures as you disassemble the parts; this will help immensely during reassembly.
This guide provides a general outline. Always consult a service manual specific to your 1998 Chevy Blazer for detailed instructions, torque specifications, and safety precautions. Improper repair can result in dangerous driving conditions.
