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Weird Noise Out Of No Where - Ac or Alt Bearing?

 
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Old 12-21-2012, 04:01 PM
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Icon8 Weird Noise Out Of No Where - Ac or Alt Bearing?

I drove down to Fresno lastnight and when getting off the highway I heard a weird noise like my steering pump had air in it.

I pulled over at a gas station opened the hood and it sounded horribe. There weren't any bubbles in the power steering resivor but the sound is coming from that area.

Could the bearings of the ac or alternator sound similar to a bad ps pump? I turned on the ac and the noise went away for a few mins until the ac kicked off.

I will try to get a video for the sound soon.



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Last edited by dr2day; 12-21-2012 at 06:11 PM. Reason: Added video links
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Old 12-21-2012, 06:06 PM
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Re: Weird Noise Out Of No Where - Ac or Alt Bearing?

yes it could be the ac pully bearing. when i had it go out in my truck, it was like a constant grinding noise when the ac was off. it was the first real car repair i did, and as long as you get a pully puller, you should be able to hammer out and hammer in the bearing (using a woodblock or washers to push evenly)

edit. actually i think the pump in our cars is near the bottom. could be a little bit more difficult to pull the pully. needs to be done on the car because you need to have a vacuum pump to get the coolant out of the system before disconnecting the lines if you do decide to .

Last edited by rocker22dallas; 12-21-2012 at 06:11 PM.
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Old 12-21-2012, 06:14 PM
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Re: Weird Noise Out Of No Where - Ac or Alt Bearing?

Im starting to think it might be the Alt because it seems to make the noise when there is an electrical lad. Let me know what you think about the whrooling sound in the video.
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Old 12-21-2012, 06:15 PM
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Re: Weird Noise Out Of No Where - Ac or Alt Bearing?

your powersteering fluid is too full. just saying lol
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Old 12-21-2012, 06:16 PM
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Re: Weird Noise Out Of No Where - Ac or Alt Bearing?

Really? It was at the max line when cold.
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Old 12-21-2012, 06:20 PM
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Re: Weird Noise Out Of No Where - Ac or Alt Bearing?

oh alright lol. i just noticed in the video. didnt know it went up when the car was on.
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Old 12-21-2012, 06:22 PM
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Re: Weird Noise Out Of No Where - Ac or Alt Bearing?

Yea it bounces around in the cup making it look fuller then it actually is.
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Old 12-21-2012, 07:58 PM
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Re: Weird Noise Out Of No Where - Ac or Alt Bearing?

both of my alternator bearings are going out, an it sounds like more of a ting type of grind, like little steel balls bouncing around really fast in a metal container.
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Old 12-21-2012, 09:54 PM
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Re: Weird Noise Out Of No Where - Ac or Alt Bearing?

Hmm it doesn't sound like a ting for me. Mine is like a whine.
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Old 12-22-2012, 02:11 AM
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Re: Weird Noise Out Of No Where - Ac or Alt Bearing?

I know if any of the belts are too tight, that puts extra force on the components and usually causes the bearings to make noise.
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Old 12-22-2012, 02:28 AM
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Re: Weird Noise Out Of No Where - Ac or Alt Bearing?

Is that something that would happen over time? This just started happening, and the last time i touched the belts was almost a year ago.
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Old 12-22-2012, 01:37 PM
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Re: Weird Noise Out Of No Where - Ac or Alt Bearing?

try an auto stethoscope. sears has 'em.
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Old 12-22-2012, 08:16 PM
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Re: Weird Noise Out Of No Where - Ac or Alt Bearing?

I picked one up from harbor freight. Will give it a try when it stops raining.
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Old 12-24-2012, 05:04 PM
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Re: Weird Noise Out Of No Where - Ac or Alt Bearing?

Still can't figure it out
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Old 01-15-2013, 01:06 AM
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Re: Weird Noise Out Of No Where - Ac or Alt Bearing?

Problem fixed with new alternator. Tried replacing bearings in the old one but the sound was still there.
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Old 01-15-2013, 11:51 AM
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Re: Weird Noise Out Of No Where - Ac or Alt Bearing?

I would guess the problem lies in the clutch assembly in the A/C compressor based on your description.
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Old 01-15-2013, 11:53 AM
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Re: Weird Noise Out Of No Where - Ac or Alt Bearing?

Ah yeah good call with the alt. unit
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