When my 2008 Jeep Patriot is idling it makes a loud screeching noise also it's just super loud in general when I took it to the shop they told me my alternater was dirty and rusted and there was something knocking around in there so they said I should fix it I don't know if that's the problem or what's makeing it loud and how to fix bc I'm going on a trip soon ?
My car has 120000 miles.
My car has an automatic transmission.
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