Hi,
What I suggest is to pressure test the cooling system. I have a feeling it may be coming from the water pump. There is a weep hole on it which will leak when the seal or bearing in the pump starts going bad. That will make its way to the serpentine belt. The only way to confirm that is the issue is to pressure test the system; otherwise, it becomes a guessing game.
Here is a link that explains how it is done. You will need a pressure tester, but most times, a parts store will lend one to you. Once the system is pressurized (cold engine), you can get in there and see where it is coming from. If it is the pump, you will have to look behind the pulley on the pump to see if it is wet.
https://www.2carpros.com/articles/radiator-pressure-test
Do this and let me know what you find.
Take care,
Joe
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Tuesday, December 31st, 2019 AT 11:25 PM