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I’ve replaced both serpentine and supercharger belts and after driving for a few miles I get a really bad squeal and doesn’t go away when driving. If I push the clutch in and let it idle there’s no squeal. Only when the engine is under load. I can start it up cold and rev it and drive and there’s no noise. Just comes in after some driving. I haven’t replaced the tensioner yet but both belts are new and I can’t see any pulleys being bad. I’m running an old Paxton novi supercharger kit. I’m running out of ideas
 

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alignment of pulleys and or/ a bearing

when it is squealing, get a spray bottle of water and spray the belt and find out if the squeal goes away
 
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