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I would suggest that this noise is the exhaust cooling down it gets up to 1000F when running and that hot of metal makes noise as it contracts and cools.
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The growling noise that you are hearing when you accelerate is likely caused by a problem with your timing chain. The timing chain is a critical component in the engine that helps to synchronize the movement of the pistons and the camshafts. If the timing chain is loose or damaged, it can cause a growling or rattling noise, especially when the engine is under load. This can be a serious issue because a faulty timing chain can cause the engine to misfire or even fail. If you are hearing this noise, it is recommended that you have your vehicle checked by a mechanic as soon as possible to diagnose and repair the problem.
This could be one of two things. We will first start with a wheel bearing. When you are driving, does the growling noise get louder as you go faster. Some times is will sound like you have a helicopter flying beside you depending on how bad the bearing is. The second thing that could be causing the growling noise is your transmission. There are also bearings inside your transmission that could be causing the noise. If you have a cvt transmission, you have a 120,000 mile warranty and can have it repaired at no cost to you. You will just have to go to a nissan dealership.
My guess would be a failing bearing in one of the pulleys. You could remove the serpentine belt and check the pulleys one at a time to see if you can find the bad bearing.
THE ALTERNATORS ON THESE VEHICLES HAVE AN OVERRUNNING CLUTCH ON THE PULLEY,AND CAN MAKE A NOISE WHEN SHUT OFF VEHICLE..OPEN THE HOOD,SART ENGINE,THEN GET SOMEONE ELSE TO SHUT ENGINE OFF..LOOK INTO SLOTS OF ALTERNATOR AND SEE IF INTERNAL OF ALTERNATOR STILL SPINS FOR A COUPLE OF SECONDS AFTER ENGINE IS SHUT OFF..I HAVE SEEN THIS PROBLEM BEFORE..IF SO..REPLACE ALTERNATOR
Take all of the belts off for a short run at idle. If the sound goes away it is pulley related, spin each pulley and listen for bearing noise, also check for play at this time.
If the noise does not go away when the motor is driving no accessories you have a more serious problem.
Are you sure the noise is coming from the compressor and not the belt tensioner or other accessories, when you turn the ac on it put more of a load on the engine. If not since the compressor was changed twice was it properly oiled and the clutch turned manually to insure proper lubrication. I am hoping if it is the compressor that the reciever dryer and expansion valve was changed and the ac system was flushed well, to insure no contamination, or blockage damaging the new compressor.
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