Hi,
What you described sounds like a loose belt. The alt is under a heavy load when it is first started, so that is when you will hear it. Plus, if you turn the blower motor on, that adds more of a load.
I attached two pics below for your review. The first shows there are three belts. The second shows the alternator and other components.
Here is what you need to do. Loosen the adjustment bolt and the pivot bolt just enough that you are able to move the alternator. Using a pry bar, gently place pressure to the left of the alternator so the belt becomes tight. Tighten it enough so you can move the belt approximately 3/4" up and down and tighten the adjustment bolt while you hold pressure on it. Last, tighten the pivot bolt.
Let me know if this helps.
Take care,
joe
See pics below.
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Saturday, March 11th, 2023 AT 7:54 PM