Question about 1999 Chevrolet Blazer

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Chevy Blazer Humming Noise

As soon as I start moving at about 15mph or so you hear the noise. It is really loud at about 45-55mph. Even when you do about 35mph and then let off the gas to coast down you'll hear it loud and clear. Not sure if it is the transfer case or the rear differential

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  • Chevrolet Master
  • 5,332 Answers

Are you sure its not a wheel bearing? does the noise change if you take a corner to the left or right?

Posted on Apr 30, 2013

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6ya6ya
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Posted on Jan 02, 2017

  • 7 Answers

SOURCE: transfer case clunk 2000 chevy silverado 1500 4x4

One thing to check, which is often the culprit in these situations is the U-joints. With the truck off, crawl under the vehicle and grab hold of the shaft leading into as well as the shaft going out of your transfer case, If htere is a lot of "slop in it, chance are it is in need of repair. Also I would check the oil level in the transfer case, in an attempt not to challenge you intelligence, there should be a plug located in the lower part about 2 inches from the bottom or so. it usually has a square hole that a 1/2" ratchet fits into. Pull the plug, and stick your pinky into the hole, you should be able to feel the lubricant just below the hole, if not it is in dire need of a filling. also check for metallic remnants in the fluid. this is a sign that things are not as they should be. In that case contact a repairman for a more thorough look.

Posted on Jul 13, 2009

  • 1 Answer

SOURCE: noise in transfer case or front differential

i had the same problem.. it is the vacuum switch on the transfer case. the switch is stuck open and supplying vacuum to the vacuum diaphram under the battery box. the switch is located on the upper side of the transfer case ( not the front differential) which is located driver side of the transmission. the switch cost me about $25.00. I replaced it myself. if you do your own mechanical work you can get it done just be patient.

Posted on Dec 09, 2008

Molson02536
  • 3854 Answers

SOURCE: loud tweeting noise while driving 1996 chevy

Common noise heard when the brake pads are getting close to the end of its life and will need to be replaced. Replace the brake pads and rotors since the rotors are not that expansive, might as well replace them also.

Good luck and stay safe, thank you for using fixya.

Posted on Oct 23, 2011

udesh99
  • 97 Answers

SOURCE: There is a humming noise when driving HHR. It

I Think it must be Sylancer Mounting Bracket or Mount Problem

Posted on Oct 06, 2009

dttech
  • 4803 Answers

SOURCE: I have a2000 chevy blazer 4 wheel drive 2 door

Driveline and wheel bearing noises can be very decieving. - especially on 4X4 vehicles. These noises can travel through the vehicle and sound like they are coming from one place when they are caused by something else. I have 2 recomendations:

1. Take it to a professional that deals with 4X4 drive trains and have him lend you an ear.

2. get the thing on a lift and listen to the components with a stethescope. It could be a wheel bearing, a differential, a transfer case, or even the transmission making a noise like you have described.

Posted on Mar 06, 2011

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I have a 99 blazer 4x4 it is humming in he rear end we had the rear bearings n seals changed new diff cover new fluid and it is still humming what is it??? PLEASE HELP!!!


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When driving our 2001 montana, the noise gets really loud. Like a loud humming. What could be causing this noise? We had one wheel bearing replaced on the front left wheel which was a little loose, but...


"Loud humming" could describe many of the noises that your minivan may make. Let's start with the basics: do you hear the noise only when the van is in motion or also when the van is stopped? If you can hear the noise even when the van isn't moving, you're most likely looking at something in the engine compartment. Your serpentine belt and the alternator bearings (and, to a lesser likelihood, your power steering pump) are all sources of noise "in there." An A/C compressor on its last legs may also vibrate and cause a humming sound, though that's usually described as more of a "growl."

If you can only hear the noise when the car is in motion, the next question is whether it changes pitch/volume due to engine speed or due to road speed? For example, does the noise get quieter (momentarily, perhaps) when the transmission shifts gears? Or, does the noise simply get louder/change characteristics in a linear way as the van gets faster and/or slower?

Depending on the mileage on your van, the transmissions have been known to get quite noisy after a while, especially if you are doing sustained high-speed driving. The solution for that particular problem isn't cheap, as it involves replacing or rebuilding the transmission (the shift bands may be fine; the noise is caused by bearing wear, seal failure, and other sundry issues that still require pulling the transmission). A less expensive problem is that you might have a problem with one of your tires--a tire with separating belts may make a noise like this as it slowly tears itself apart. If you hit something hard with the undercarriage of the van, you might have a drive shaft that's slightly bent and hence is causing some sympathetic vibrations in the car because it's out of balance.

Depending on the cause, your humming sound may be one of those things that comes with driving an older car--or it may be a sign of the imminent failure of something serious. It's worth getting things checked out again to try to find the cause of the problem. You'll feel a lot better knowing what it is, even if it's something you choose not to fix.

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