To find it, you need to:
1. Consult your owner's manual: This is the most reliable source. The manual will have diagrams and instructions specific to your Cadillac model (e.g., DeVille, Seville, Escalade, CTS, etc.).
2. Look under the hood: The transmission dipstick (if equipped; some automatics don't have one) is usually near the transmission itself. It may be a bright colored handle or have a label. However, many newer transmissions do not have dipsticks.
3. Look underneath the vehicle: The transmission pan is usually located on the bottom of the transmission. You'll see a large, somewhat flat pan usually bolted to the transmission case. The drain plug is usually on the pan, and the fill plug might be on the side of the transmission. Use caution when looking underneath your vehicle. Use jack stands, not just a jack, and work in a well-lit area.
4. Use online resources: Search for "[Your Cadillac Model Year and Engine] Transmission Fluid Location" on Google Images or YouTube. You may find videos or pictures showing the exact location. Be careful to match your model and engine type exactly, as these locations can vary even between similar models.
Without knowing the specific Cadillac model (e.g., DeVille, Escalade, CTS, etc.) and transmission type (automatic or manual), it's impossible to give a precise location. Always refer to your owner's manual first for safety and accuracy.