Tools you'll likely need:
* Socket set: Various sizes, including deep sockets.
* Wrench set: Including a ratchet.
* Extension bars: To reach tight areas.
* Torque wrench: Crucial for proper tightening.
* Jack and jack stands: Essential for safety. Never work under a car supported only by a jack.
* Wheel chocks: For added safety.
* Possibly a pry bar: May be needed to help free stubborn bolts.
* Penetrating oil (like PB Blaster): Highly recommended to soak bolts before attempting removal.
* Gloves and safety glasses: Protect yourself.
* Repair manual: Absolutely essential for detailed instructions and torque specifications specific to your vehicle.
General Steps (These are general and may vary slightly depending on the exact engine):
1. Disconnect the battery: This is crucial to prevent electrical shorts and injury. Disconnect the negative (-) terminal first, then the positive (+).
2. Access the starter: This typically involves working from underneath the vehicle. You'll likely need to remove some undertray components to gain better access. The repair manual will show you exactly what needs to be removed.
3. Disconnect the electrical connections: The starter has at least two large electrical cables attached to it. Carefully disconnect these using a wrench. Take pictures or make notes on how they were connected to avoid mistakes during reinstallation.
4. Remove the starter mounting bolts: The starter is typically held in place by two or three bolts. These bolts are often in awkward positions and may be difficult to access. Use penetrating oil beforehand and be prepared to use extensions and possibly a universal joint.
5. Remove the starter: Once the bolts are removed, the starter should come free. It might be a bit snug, so gentle wiggling and possibly a slight pry might be needed. Be careful not to damage anything around the starter.
6. Installation: Reverse the above steps to install the new starter. Make sure all connections are secure and all bolts are tightened to the correct torque specifications (found in your repair manual).
7. Reconnect the battery: Reconnect the positive (+) terminal first, then the negative (-).
Important Considerations:
* Engine type: The 1999 Cadillac STS had different engine options (likely a V6 or a V8). The starter location and access will vary slightly depending on the engine.
* Repair Manual: This cannot be stressed enough. A repair manual specific to your year and model will provide diagrams, torque specifications, and detailed steps.
* Safety: Always work in a well-ventilated area. Use jack stands, chocks, and safety glasses.
This is a complex task. If you're not comfortable working on your car yourself, it's best to take it to a qualified mechanic. Attempting this without the proper knowledge and tools can lead to damage to your vehicle or personal injury.
