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My Altima 2006 2.5S has been making a strange fluttering-type sound (coming from under the hood) when I start it up, though it goes away in 5-10 minutes. No other indication that there are any issues.

I recently got an inspection at Firestone, they didn't find any problems (though this was before the sound started up), but did tell me to get a coolant flush. I'm not sure whether they recommend that based on mileage or if they actually looked at it. Also not sure if coolant problems could be causing this strange sound.

My mileage is 154,000, so getting up there in years. Would appreciate any help or tips on this!
 
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