Serpentine belt replacement?

2008 PONTIAC GRAND PRIX
127,500 MILES • AUTOMATIC
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BTSATTEL
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  • 1 POST
Which pulley is the tensioner
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May 23, 2026 at 4:05 PM
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STRAILER
  • ✓Experienced Mechanic
  • 55,691 POSTS
I assume you need the belt diagrams for the 3.8 correct? Here is a diagram which I marked the tensioner pulley for you and a guide to help you do the job as well.

https://www.2carpros.com/articles/replace-serpentine-belt/

Check out the images (below). Let me know if you need anything else.
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May 23, 2026 at 7:54 PM
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