Hello,
It does look like you can bypass the AC belt if you remove the idle near the alternator.
Here is a guide that will give you an idea on how to remove the belt:
https://www.2carpros.com/articles/replace-serpentine-belt
As far as the size you will need to take the original size and go four inches shorter to start. By three or four lengths to narrow it down it will take some trial and error when you find the size it will be good if you could post it to help others. I have seen people take a string and run it around the belt routing to get an idea of the length as well.
Check out the diagrams (below).
Let us know what happens and please upload pictures or videos of the problem.
Cheers, Ken
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Saturday, December 9th, 2017 AT 7:39 PM