Tools You'll Need:
* Socket wrench set: Metric and standard, including extensions and possibly a universal joint for better access.
* Ratchet: A comfortable ratchet is essential.
* Wrench set: For various bolts and potentially nuts.
* Jack and jack stands: Crucial for safe working conditions.
* Wheel chocks: To prevent the vehicle from rolling.
* Penetrating oil (PB Blaster or similar): To loosen rusted or stuck bolts.
* Wire brush: To clean battery terminals and bolt heads.
* New starter motor: Make sure it's the correct one for your specific Blazer engine (e.g., 4.3L, 5.7L, 6.2L).
* Gloves and safety glasses: Always protect yourself.
* Torque wrench (optional but recommended): To tighten bolts to the manufacturer's specifications.
Steps:
1. Safety First: Park the Blazer on a level surface, engage the parking brake, and chock the wheels. Disconnect the negative battery terminal.
2. Access the Starter: The location of the starter varies slightly depending on the engine. Generally, it's on the passenger side of the engine, somewhere near the bell housing (the area where the engine connects to the transmission). You'll likely need to work underneath the vehicle. Jack up the Blazer and securely support it with jack stands.
3. Disconnect the Electrical Connections: Carefully remove the cables connected to the starter. There's usually a large positive cable and a smaller cable. Take pictures or make notes to remember their positions. Use a wire brush to clean the terminals before disconnecting.
4. Remove the Starter Bolts: The starter is usually held in place by two or three bolts. These bolts can be very stubborn, especially if they are rusted. Generously apply penetrating oil and allow it to soak for a while before attempting to remove them. You may need to use a breaker bar for extra leverage.
5. Remove the Starter: Once the bolts are removed, carefully remove the starter. It might be a little tight due to its position, but it should come out relatively easily.
6. Install the New Starter: Carefully install the new starter, ensuring it aligns properly with the mounting holes.
7. Secure the New Starter: Tighten the bolts securely, but avoid over-tightening. Use a torque wrench if you have one to tighten to the manufacturer's specifications (check your repair manual).
8. Reconnect the Electrical Connections: Reconnect the positive and smaller cables to the new starter, ensuring they are securely fastened.
9. Lower the Vehicle: Carefully lower the Blazer using the jack.
10. Reconnect the Battery: Reconnect the negative battery terminal.
11. Test the Starter: Try starting the Blazer. If it doesn't start, double-check all connections and bolts.
Important Considerations:
* Repair Manual: A repair manual specific to your 1990 Chevy Blazer is highly recommended. It will provide detailed diagrams, torque specifications, and other valuable information.
* Engine Type: The exact procedure may vary slightly depending on whether you have a 4.3L, 5.7L, or 6.2L engine.
* Difficulty: This is not a beginner-level repair. If you're not comfortable working on your vehicle, consider taking it to a qualified mechanic.
This is a general guide, and the specific steps might vary slightly depending on your Blazer's configuration. Always consult a repair manual for detailed instructions specific to your vehicle. Safety is paramount; if you are unsure about any step, seek professional help.
