Good morning, westruck,
How does the serpentine belt look? A worn belt, especially if it is glazed, can cause it to slip and not move the pump.
I have added a picture to help you identify any issues with the belt.
Depending on how old the belt is it may not crack if it's old because it is made from a different material than the older belt used to be. So, try pushing on it and seeing how much it stretches, it should flex more than a half inch or so. Also check the underside and see how deep the ridges are on it. Just like a tire this will tell you how worn the belt is. They make a little plastic tool to check. I will add a picture of it for you.
Let me know what you find.
Thank you,
Brendon
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Wednesday, March 29th, 2023 AT 5:05 AM