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This is your radiator fan... it willl pull air through when it is needed to keep your engine and coolant cool... if your engine needs to cool quickly it will blow harder making the "roaring" sound louder
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Hi Chris, I'm glad to help! Vibrating / Roaring sounds can be anything from rear or front diff problems. Drive Line U-Joint problem. Wheel bearing bad. Even transmission problem. You have to pin-point where the vibration is, is it in the front, in the rear, on the right or on the left. Is it in the center of the vehicle and so on. Hope this helps and have an awesome day Chris!
THIS NOISE IS USUALLY THE HUB. HAVE SOMEONE GO WITH YOU ON A TEST DRIVE. GET THE ROARING TO HAPPEN AT ITS LOUDEST AND GENTLY SWERVE THE CAR LEFT AND RIGHT. DON'T BE SURPRISED IF YOU THINK BOTH HUBS ARE BAD.
LIFT THE FRONT OF THE CAR AND PUT IT ON JACK STANDS. PULL OUTWARD ON THE BOTTOM OF THE TIRE WHILE PUSHING INWARD ON THE TOP OF THE WHEEL. IF THE WHEEL MOVES EXCESSIVELY YOU FOUND THE HUB THAT IS NOISY.
USING A MECHANICS STETHOSCOPE YOU CAN SOMETIMES HEAR A ROARING TYPE NOISE ON THE BACKING PLATE SIDE OF THE HUB WITH THE ENGINE RUNNING AND THE TRANS IN GEAR. TRY NOT TO GET THE SPEED UP TOO FAR ESPECIALLY IF YOU CAN HEAR THE NOISE AT LOW SPEED, YOU DON'T WANT TO VIBRATE OFF THE STANDS.
I have the same thing. It started last summer when I had about 20,000 miles. I just took it into the dealer. They say it is the antenna and that they removed it and tested drove it and the noise went away. Mine starts around 35 mph. I don't know if they are pulling my leg and there is a bigger problem that the financially strapped GM won't fix. I also have a bad CV joint and unless it goes out within the next 500 miles, GM won't replace it.
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