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Metal to metal noise happens on start up around alternator/air con belts

I have checked belts and all okay. When the motor starts a screaching noise is heard and may last for 30 seconds. In the area of the aircon, alternator and belt sets I can see very fine metal shavings. My visual inspection can't see where the metal is grinding but I sure can hear it. It is my wifes car so I must fix it. Any help appreciated.

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

kevinpenney
  • 2 Answers

SOURCE: power steering problem, noise coming from engine, 97 montero

Your experiencing the same thing my 02 is experiencing- your crankshaft pulley is slipping on the crankshaft. It only does it under load, i.e. turning steering wheel(loads the power steering pump) running heater blower on high with headlights on (loading the alternator) or running the a/c with blower (loading the a/c compressor and alternator). Turning off all lights, blowers, ac, etc and allowing the car to idle should kill the slipping until loaded again. This problem is very serious and very expensive if your don't catch it early. It require repairs ranging from tightening the crank to pulley bolt, to replacing the pulley AND your crankshaft if it is allowed to continue. if you cannot get it serviced immediately then do your best to keep loads off of your belts by driving with the blower off, A/C off, and lights used only when necessary. Also try to avoid extreme tight turns which load your power steering pump. Your repair, if not done asap, will cost you upwards of around $3k since the motor must be removed and completely torn down to replace your crankshaft and pulley. I would seek a tech who will exhaust every other method- i.e. sleeving, welding, etc. to effect a repair. Just don't put it off because it will only get worse...

Posted on Jan 05, 2009

SOURCE: Having trouble starting car. The battery is fine

Lights burning do not necessarily mean the battery will turn over the engine. If you found a shredded belt, it is probably the alternator belt and this has run down the battery.

If the belt just wore out, replacing it may solve the problem.

If a seized alternator caused the belt to shred, the alternator will have to be replaced.

Charlie

Posted on Aug 14, 2009

  • 21 Answers

SOURCE: metal shavings around fan belt...

You may have a bad a/c clutch going bad or a bad pully going bad.

Posted on Sep 14, 2009

  • 5 Answers

SOURCE: My car only makes a clicking noise in the mornings

its just the car needing to warm up.

Posted on Sep 07, 2010

  • 7353 Answers

SOURCE: metallic grinding noise coming from front of

Waterpump?? belt tensioner? pulley?

Posted on Nov 18, 2010

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could be loose alternator belt..if you can turn the alternator pulley by hand..its too loose..

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It sounds like the alternator has went out. They have bearings in them that eventually wear out. When this happens, they can make a screaching noise, or the bearing itself can lock up, causing the belt to slip and make a similar noise. Both of these scenarios will get louder as you accelerate. When the alternator is not charging your battery correctly, your vehicles electrical system will drain the battery.

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I have a screeching noise when I start my 2001 kia optima. My belt that I see is tight and I see no leaks of oil getting on it. I have checked the power steering fluid.


Hi Julie,

If your belt only "screeches" when you first start your engine, the problem is most likely to be related to either your alternator or your air conditioner. Sometimes the bearings in these things start getting worn and cause excess resistance to rotation and will cause a screaching noise that goes away once they are moving. This usually also causes "glazing" on the belt.

Look at the ribbed side of the belt. If it looks "shiny" rather than just a dull black, this is glazing. It may not be necessary at this time to replace anything like the alternator or the air conditioning compressor, but I would recommend replacing a glazed belt and do a THOROUGH check of your pully assemblies while you have the belt off.
Spin all of the pullies (including the tensioner and idler pullies) by hand with the belt off. You should not be able to "hear" them spinning. Any pully or component that feels rough or has a rough or rattling sound when you spin it by hand should probably be replaced.

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It struggles to start sometimes, other times it doesnt. yesyerday i heard a screaching noise while driving, later that night it wouldnt start. the car lights were diming then nithing


Check your belts, the screaching noise was probably coming from the belt slipping. Make sure the alternator and all the pulleys are turning freely.

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Now that the weather is cold my 2002 Sonata is making a loud screaching noise when it starts what is it?


Your belt is slipping. As the belt ages, the surface gets hard and 'glazed', causing it to slip at one of the pulleys it spins (water pump, alternator, etc). Replace the belt and it should be fine.

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1 Answer

I have a loud engine noise--somewhat high pitch whine--except really loud and only after so many rpms. The noise happens when I am running my air conditioner. Ten to 15 miles after I first noticed the...


So when you turn off the air con the noise stops ..
If yes then its the bearings in the Air Con pump which is driven by the same belt and when turning the r13 coolant around the bearings being dry and worn out will start to make the noise Same as the water pump does when it goes, but yours is Air Con Pump.
DONT TAKE IT OFF YOUR SELF. RON

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Your alternator has a belt that rotates it. Either the bearing on the pulley wheel on the alternator where the belt seats in is bad or tighten your belt.

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ok if the noise is there all the time then it may still be the alternator but do this if is not to check it yourself start the car turn the headlights on, if no nose, then turn on the heater, then turn on the a/c if the noise starts during any of this its probably going to be the alternator been through this all night tonight replaced the belts first and still has a loud screaching noise after I turn on the heater and or A/C you can have the alternator load tested for free at any Autozone if you have them around because alternators are about 175 new not cheap tell me about it as I have to buy one now but this how we eliminated the other stuff before spending a ton of money on it hope this helps have a great day

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its really really easy to find without diagrams. find the alternator (metallic colour, has cooling fan on front with pulley and 3-4 wires coming off back of it.
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