Tools You'll Likely Need:
* Socket wrench set (metric)
* Ratchet and extensions
* Torque wrench
* Jack and jack stands (crucial for safety)
* Wheel chocks
* Pry bar or small crowbar (possibly)
* Wire brush
* Penetrating oil (like PB Blaster)
* New starter motor
* Gloves
* Safety glasses
General Steps (May Vary):
1. Safety First: Park on a level surface, engage the parking brake, and chock the wheels. Disconnect the negative battery terminal.
2. Access the Starter: The starter's location varies by year and model. It's usually located on the engine block, often near the transmission bell housing. You may need to remove some components for better access. This might include:
* Removing the air intake system: This often involves disconnecting hoses and clamps.
* Removing parts of the exhaust system: This may require loosening exhaust manifold bolts or exhaust pipes.
* Removing the battery: In some models, removing the battery may provide more room.
* Removing the engine splash shield: This usually involves removing a few bolts.
3. Disconnect the Starter:
* Battery Cable(s): Locate the large positive and negative cables connected to the starter. Use a wrench to disconnect these cables. Take note of their positions for reassembly.
* Starter Wires: There are usually smaller wires connected to the starter solenoid. Disconnect these carefully.
4. Remove the Starter Bolts: The starter is usually held in place by one or two bolts. These bolts can be very stubborn, so apply penetrating oil and allow it to soak for some time before attempting to remove them. Use the appropriate size socket and ratchet to remove the bolts.
5. Remove the Starter: Once the bolts are removed, the starter should be able to be pulled away from the engine block. It might be a bit tight, so you may need to use a pry bar carefully to gently leverage it free. Be cautious not to damage any surrounding components.
6. Install the New Starter:
* Clean the Mounting Surface: Clean the mounting surface on the engine block to ensure a good connection.
* Install the Starter: Carefully align the new starter with the mounting holes and install the bolts. Tighten them to the manufacturer's specifications (consult your repair manual).
* Reconnect the Wires: Reconnect the battery cables and smaller wires to the new starter in the same manner you disconnected them from the old starter.
7. Reconnect and Test: Reconnect the battery, carefully reassemble any removed components, and start the engine to test the new starter. If the engine cranks smoothly, the replacement was successful. If not, double-check all connections and bolts.
Important Notes:
* Repair Manual: This is crucial. A repair manual specific to your year and model will provide detailed diagrams and instructions.
* Safety: Working under a vehicle can be dangerous. Always use jack stands and follow proper safety procedures.
* Torque Specifications: Tighten bolts to the manufacturer's specified torque values to avoid damaging threads or components.
If you are not comfortable performing this repair yourself, it's best to take your Trailblazer to a qualified mechanic. Attempting this repair without proper knowledge and tools can lead to further damage and injury.
