I recently noticed a "flapping" sound coming from passenger side of truck. Somewhere between the engine and middle of truck. Sounds as if a piece of the belt is flapping but that's not it. No loss of power or anything else. Any thoughts??? Most noticeable when idling.

Thanks...

 

In motion or stopped? If it's while stopped I'd be looking at the EVAP Purge Canister located in that area. Mine makes the same noise. lol

 

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