The noise doesn't occur every time I drive. I can't see anything when I look under the hood (but then again I don't know what I'm looking for). The noise starts when I am accelerating and seems to be louder when I brake. It does not make the noise while idling. The humming almost sound like it's tired or running out of something. All my fluids have been recently filled. My serpentine belt has a crack in it (but I was told that makes a "squeaky" noise which I do hear)
The noise is coming from the wheel section, it's called air splash, humming varies with speed, main causes are wheel alignment due to loose ball joint, check if your tire erodes on one side, next check your disc brake for clogged air cooled vain and disc wearing
SOURCE: broken hood
look under the car or behind the grill there should be a black cable running to the under side of hood.if you ''skin'' the black plastic back you will find a metal wire.now take two pairs of pliers.one to hold the black casing and one to pull the wire.that should open hood.once hood is open you'll see where cable attaches to hood latch.that cable needs replacing.
CHECK THE PARK BRAKE CABLE JUST IN FRONT OF THE LEAF SPRING HANGER. IT MAY HAVE A CHAFFING MARK WHERE IT HAS RUBBED THE CABLE CASE.
SOURCE: 1997 chevy blazer,serpentine belt making
May be a worn belt or a pulley whose bearings are shot. Remove belt and check it for the ribs having broken down or missing parts of belt. While it's off, check all your pulleys for turning freely, alternator, tensioner pulley, a/c compressor, PS pulley...If you hear any noise when spinning them, or feel any movement like wobbling, or if they have a rough feel, then its likely that pulley needs replacing.
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