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I own a 2006 Impreza sedan with 134k miles. When I started the car today I heard a loud squeal. I couldn't tell if it was belt, idler pulley or AC clutch bearing. I removed the idler pulley and checked it. It seems to be rolling fine and not binding. Once I put it back together the squeal was gone until I turned on the fan. When the fan was on it would squeal, when off no squeal. Anyone else experience this? Thoughts on repair. Thanks

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Is the AC or front defrost on? Either of these settings will engage the AC compressor when the fan is on.

 

Turn the fan on the vent or floor setting and turn the AC off and on. Does the squeal happen only with the AC on? If so, the AC belt is loose and probably needs to be replaced.

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