What size serpentine belt do i need to bypass ac pulley on 97 Pontiac Transport?

There isn't a single, universally correct serpentine belt size for a 1997 Pontiac Transport with the AC pulley bypassed. The correct size depends on the engine's displacement (3.1L or 3.8L) and whether other accessories (like power steering) are still in use. Bypassing the AC pulley changes the routing and overall length required.

You cannot determine the correct belt size without physically inspecting your vehicle's belt routing after removing the AC pulley. Even then, it's tricky to measure precisely without the right tools.

Here's what you should do:

1. Remove the AC pulley: Once the AC pulley is off, you'll see the new routing of the belt.

2. Take the old belt to an auto parts store: This is the *best* method. They have the tools and expertise to measure the belt and find the correct replacement. Explain that you've bypassed the AC compressor.

3. Measure the belt (less accurate): If you must measure yourself, use a flexible tape measure and carefully measure the *outside perimeter* of the belt's path around all pulleys. This measurement is only a rough guide, and the store may still need to fine-tune it.

Caution: Using an incorrectly sized belt can cause premature wear, belt slippage, or even damage to other components. It's crucial to get the right size.