take and measure the routing of belt minus ac and put new belt on

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it could be belt pulley rubbing on the timing belt cover or it could be the berries in the wheel but if its making grinding noise while ilding then def check your pulley make sure it isn't rubbing on anything or it could be the flywheel theres numbers of things to check over for the grinding noise

most definetly can casue overheating and probaly cook the belt too

The bearings on the alternator could be going bad. Remove the belt from the alternator then spin the alternator by hand to listen for grinding.