To be completely sure and avoid confusion, consult your owner's manual. It will have a diagram showing the exact location and any special instructions. If you don't have the manual, you can often find a free PDF version online by searching for "[Year] Pontiac Transport owner's manual".
A quick online image search for "1994 Pontiac Transport engine bay" might also help you visually locate it. Just remember that engine bay layouts can vary slightly depending on options and specific model.