Hi and thanks for using 2carpros.com
First, I attached a picture showing how the belt should be routed. Make sure that is correct and make sure it isn't hanging up on a bracket or other component.
See Pic 1
If it is routed correctly, release the pressure from the automatic tensioner which should allow you to get the belt over the last pulley. Here is a link that describes the tensioner and how it works:
https://www.2carpros.com/articles/how-a-serpentine-belt-tensioner-works
Let me know if this helps or if you have other questions.
Take care,
Joe
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Sunday, January 27th, 2019 AT 9:08 PM