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Noise Water Pump or Alternator?
Posted by: Microman
Date: October 24, 2015 01:57PM
Only symptoms I notice inside the 2009 Toyota Corolla is the noise, sounding like a whirring with the rev of the engine. And occasionally since the noise started the tach will stay a little high at idle, until I drive it a little.

I loosened the fan belt. Mine actually loosens via the alternator long bolt that releases tension on belt.

I did use a Harbor Freight Stethoscope thing to listen and it certainly sounds like its coming from the alternator.

After putting the belt back on, and running an errand, I saw a youtube video, that shows that that idle pulley that is right next to the Alternator is the Water Pump assembly.

So now I will listen closely and try to determine if I stick the Stethoscope into the Alternator which is really loud or being careful and sticking it around the base of pulley on water pump , whether it is the pump.

I think by the fact that TACH is running slightly high sometimes, and that the pulley on the Alternator does have a small wiggle side to side when I hold onto the pulley, and that the Stethoscope sounds really loud on the alternator, that may be my choice. No leaking of water or coolant

Just don't want to do ALT, and then not have it be that.

Should I have my ALT rebuilt at one of those ELECT Auto Places that can fix the Bearing, or go for a remanufactured one at Clarks for around $100+
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Re: Noise Water Pump or Alternator?
Posted by: fauch
Date: October 24, 2015 02:06PM
My car did this for a few years, they kept saying it was nothing. Then the Alternator died and when they replaced it suddenly no noise... So either it WAS the alternator (which I surmise it WAS because it caused horrible interference on my bluetooth that sounded like a dentist drill) or it was something related to the belts which was fixed when they swapped the alternator....
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Re: Noise Water Pump or Alternator?
Posted by: MikeF
Date: October 24, 2015 02:14PM
If you aren't having any temperature-related car symptoms, then I would think it's probably something other than the water pump.
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Re: Noise Water Pump or Alternator?
Posted by: Racer X
Date: October 24, 2015 02:53PM
Not true Mike. Water pumps have an inner seal, bearing, outer seal, and frequently a weep hole. The inner seal can leak, and cause the bearings to corrode and make noise. The coolant will usually run out of the weep hole. Eventually the bearings will fully fail, and water will gush out. Sometimes the shaft will snap, or send the impeller into the block. If it is a rear wheel drive with a water pump-driven fan, sometimes the fan goes through the hood or through the radiator.

Frequently you can swipe a finger at the base of the water pump neck, you can find coolant or a rust trail (if there is iron involved in the cooling system) at the weep hole.
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Re: Noise Water Pump or Alternator?
Posted by: mrbigstuff
Date: October 24, 2015 07:54PM
as always

ad nauseum


Hurts like a bastid...
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Re: Noise Water Pump or Alternator?
Posted by: RAMd®d
Date: October 25, 2015 02:35PM
You might try grabbing the pulley on the water pump and move it back and forth/up/down.

If it wiggles even a little, it's bad and will get worse.

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