To find it precisely, you'll need to:
1. Consult your Silverado's repair manual: This is the most reliable way to determine the exact location for your specific year and model. The manual will have diagrams and instructions.
2. Search online for your specific year and model: Many forums and YouTube videos show the process of replacing the blower motor resistor on various Silverado years. Searching for "[Your Silverado Year] Silverado blower motor resistor replacement" should yield helpful results.
Expect to need to remove some parts of the dashboard or glove box to access it. It might be behind a panel, and could be held in place with screws or clips. Always disconnect the battery's negative terminal before working on the electrical system.