Here's a general guide, but consult a repair manual specific to your Blazer's year, engine, and transmission for precise details and diagrams. A repair manual will show you exactly where things are located and give torque specifications. Improper torque can damage components.
Tools you'll likely need:
* Socket wrench set (metric)
* Ratchet
* Extensions
* Wrenches (metric)
* Jack and jack stands (essential for safety)
* Wheel chocks
* Wire brush
* Pry bar (possibly)
* New starter motor
* Safety glasses
* Gloves
General Steps:
1. Safety First: Disconnect the negative battery cable. This prevents accidental shorts and shocks.
2. Access the Starter: This is the hardest part and varies significantly by engine and transmission. Generally, you'll need to:
* Jack up the vehicle: Securely lift the front end of the Blazer and place it on jack stands. Never work under a vehicle supported only by a jack.
* Remove the necessary components: This might involve removing the air intake, some engine shielding, parts of the exhaust system, or even the lower radiator hose. The starter is typically located on the passenger side of the engine, near the bellhousing (the area connecting the engine to the transmission). Your repair manual will guide you here.
3. Disconnect the Starter Wiring: There will be two large cables connected to the starter. One is the positive (+) battery cable (often very thick), and the other is the small wire for the solenoid. Use a wrench to carefully remove the nuts securing these cables. Take note of their placement so you can reassemble correctly.
4. Remove the Starter Mounting Bolts: Typically, there are two or three bolts holding the starter to the engine block. These can be difficult to access and may require extensions or a combination of sockets and wrenches. Loosen these bolts before attempting to fully remove the starter.
5. Remove the Starter: Once the bolts are loose, carefully wiggle the starter out of its mounting location. It might be stuck due to corrosion; a gentle pry bar can help, but be cautious not to damage any surrounding parts.
6. Install the New Starter: Carefully install the new starter, making sure it's properly aligned with the mounting holes.
7. Secure the New Starter: Tighten the mounting bolts to the manufacturer's specified torque (find this in your repair manual).
8. Reconnect the Wiring: Carefully reconnect the positive (+) and solenoid wires to the new starter, ensuring secure connections.
9. Reassemble: Reinstall any components you removed to access the starter.
10. Lower the Vehicle: Carefully lower the Blazer from the jack stands.
11. Reconnect the Battery: Reconnect the negative battery cable.
12. Test the Starter: Attempt to start the engine. If it doesn't work, double-check all connections and wiring.
Important Considerations:
* Corrosion: Clean the battery terminals and starter mounting surfaces with a wire brush to ensure good electrical contact.
* Torque Specifications: Use the correct torque specifications from your repair manual to avoid damaging the starter or engine block.
* Professional Help: If you're not comfortable performing this repair yourself, it's best to take your Blazer to a qualified mechanic. This is not a beginner-level repair.
This is a general overview. A repair manual is absolutely crucial for this job. The exact location and access points for the starter vary greatly depending on your Blazer's engine and transmission. Do not attempt this repair without a proper manual and the appropriate tools. Working on a vehicle's electrical system can be dangerous; take all necessary safety precautions.
