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2001 sf6 now w/choo choo 4EAT
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On Saturday my Forester developed a bad whine noise from the engine bay. Sounded almost like a supercharger or something.... I suspected the alternator at first, then quickly realized it was likely the AC idler pulley.

Sure enough after a quick listen with a stethoscope we determined my AC idler pulley was the culprit. Took about 5 minutes to replace. Pulley was $37.
 
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