

The roaring you hear is excess engine noise that would normally get silenced by the muffler.
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What’s happening: You probably have a leak or crack in your exhaust system's manifold.What you hear: A loud roaring sound coming from somewhere underneath the driver’s seat.Sound #4: A Rumble & Roar Under Your Rear Or, give your car a virtual battery test online!
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Head over to your local Firestone Complete Auto Care for a free battery test and our car whisperers will let you know how much "life" is left in your battery. It may be low on fluid, be past its prime, or need a jump. A slow engine crank paired with this unfortunate noise means your battery is on the fritz. Cause for concern? This is less of a safety concern and more of a convenience concern, as your car could end up failing to start tomorrow, next week, or next month-it's tough to make an exact prediction.What’s happening:Your battery is losing juice and is struggling to power the engine.What you hear:Sounds like a grumpy cat, "rur rur rur," when you start the engine.Sound #3: A Cat That Doesn't Want to Be Touched Your mechanic can help you understand how much life, or how little life, may be left in this essential engine component. Unless you want to throw down some money for a tow truck, scheduling an appointment for a vehicle inspection may be in your best interest. When an old serpentine belt snaps, drive torque to all of the engine's accessories is lost and you're left, well…"up the creek" with a car that won't go.

A squealing serpentine belt is one that could be about to break.
