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What would cause a howling noise after engine is warm on a 2003 4.6L ford expedition? No codes, alternator & tentioner pulley are new.

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Check fan clutch if it has a belt driven fan the clutch might be locked up

Posted on Dec 13, 2014

Testimonial: "Checked the fan with engine off before & it spins freely. How can you tell if its bad? Been doing this for about a year & is getting worse. Tried everything I know!"

  • chuckelch582 Dec 14, 2014

    From the little bit of research I just did it looks like you could have a timing belt or timing tensioner problem. But if it sounds like an air leak try spraying some carb cleaner around the engine while it's running if the engine changes sound you might have found the problem.


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Posted on Jan 02, 2017

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SOURCE: crank shaft inner pulley lose on 2003 Exterra 3.3

I don't have one. I have the same problem can someone help?

Posted on Nov 22, 2008

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SOURCE: Cannot find the tensioner pulley to put my alternator back on

The smooth rounded tensioner pulley has a 1/2 inch drive recessed ratchet drive fitting in the outer side of it. Reach down and feel it with your fingers and insert the ratchet drive into it. Look around the underside of the hood and engine bay for a small diagram showing the belt, pulleys and tensioner.

This pulley is either a slider or a spring loaded pulley. If it is a slider, there will be one or two bolts with "slide" areas that the bolt can move through, and possibly a third bolt that controls the tension. If it is a spring loader, there will be a pulley that looks like it is on a lever. There will be a "bolt" type head, a hole for a ratchet, or a square area on the end of the lever to twist it away from the belt. If it is one of these, the belt tensioner will move relatively easy.

Posted on Aug 18, 2009

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SOURCE: noisy water pump pulley,alternator pulley..timing belt tensioner

I have a 1995 xj6....same problem. I replaced the belts, water pump, and the alternator. Still does it. As I play with the tension on the belt (belt that drives water pump, alternator) it goes away and comes back. If I remove the belt, the metal to metal screech stops. I then, with just the belt, turned the main pulley on the front of the engine, and there was the sound! The main pulley has 2 belts that run on it. Also, 2 pulley tracks. They SHOULD move simultaneously and be super meshed. But the rear one moves on its own under tension until it warms up and I guess, the bushing maybe expands. do I fix it??????

Posted on Nov 17, 2009

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SOURCE: 2000 Ford Expedition. My battery light came on and

If garage replaced alternator, return vehicle for warranty work.

If you replaced alternator, what was wrong woth old unit??

Provided regulator is internal with alterantor, fault is with alternator.

If an external regulator is used then its faulty.

What voltage reading are you getting at idle / 1500rpm??

Posted on Dec 20, 2009

  • 1985 Answers

SOURCE: Noise coming from alternator belt pulley

never spray wd40 on your belts,if it gets on the pulley the alternator or power steering will slip and not work,
listen with an extension bar and pin point noise,if its a bearing in something or maybe just replace the belt for cracks.

Posted on Dec 25, 2009

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2 Answers

Howling noise front end 2006 Chevy trailblazer what could it be

If the noise changes with engine rpm, possible bearing from one of the drive accessories. Idler pulley..tensioner pulley.. alternator bearing.. ac compressor bearing.. water pump bearing etc. If you remove the belt and spin all the pulleys by hand, usually a defective one will be heard/felt

Nov 21, 2015 | Cars & Trucks

1 Answer

Howling at front of engine

I would suggest,checking pulleys at front of engine, I some times use a short ( 2 to 3 Feet) length of hose such as a piece of old garden hose. Sometimes when engine is running you can place one end of hose near center of pulley, and the other end close to your ear and this will work like doctors stethascope and amplifie howling noise. Thus helping pinpoint which pulley is producing the howl. Warning if you use this method be very carefull not to let hose get caught in pulleys.

Feb 29, 2012 | 1999 Dodge Durango

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I have a noise a wining coming from the right side of engine sounds like a power steering type of noise or maybe a bearing on an alternator but they are both on the left side could it be the pulley on belt...

  • Hi, I can help.

  • This is exactly what you want to do to see which pulley is giving you the whining noise.

  • Traditionally this is the power steering pump that whines ( or grinds depending on ) but removing the serpentine belt will be the best way to test the pulleys. You can also take a long screwdriver and put the handle to your ear and the metal end on the power steering pump and then the alternator and you will be able to tell which of them it is by that too. Make sure you are paying attention and have no loose clothing, necklaces etc on so you don't get pulled in.

  • If you have any comments please feel free to leave them here.
  • Hope this helps and thank you for using FixYa.

Regards, Tony

Aug 29, 2011 | 2003 GMC Sierra 1500

1 Answer

How to fix drive belt of ford focus having no tentioner ?


Apr 03, 2011 | 2003 Ford Focus

1 Answer

Humming noise under the hood when it is warming up?

There are many things that may cause this but the most common would be a bad belt pulley or an acc, like the ac compressor clutch or the alternater, you would need to remove the belt and spin each pulley by hand to see if there noisey or loose,

Nov 08, 2010 | 1999 Ford Expedition

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High pitched howling and screeching (yes two different noises). The howling appears to happen when the air conditioning compressor pulley engages. The screeching, my guess would be from the belt. Any...

When the AC compressor kicks on, an electrical load is placed on the alternator and the drive belt that turns the alternator pulley, if not tight enough, can cause the belt to squeal. Replacing the belt should help with that noise if the belt is stretched from wear. The screeching noise can be from a bad idler pulley, a bad belt tensioner pulley or a bad alternator pulley or a failing clutch on a very old ac compressor and rarely a water pump pulley. To check pulleys remove the drive belt and turn them individually to see if they can be tilted up down or sideways with play in the "bearing" of the pulley. Also, you may wish to visually inspect the clutch on the ac and look for melted black rubber around the bolts that secure the clutch to the compressor (stinks,smokes and melts these rubber areas if ac compressor clutch fails).

Jun 06, 2010 | 1996 Saturn SL

1 Answer

Howl or whine noise inside after the a/c compressor lines replace

Be sure that oil was added when the new compressor and line were put in. It sounds as if the compressor is the one making noise. Is it a new compressor?

Mar 10, 2010 | 1999 Ford Expedition

2 Answers


The tension is set automatically with the belt tensioner. It looks like a pulley. You put a wrench or socket on the bolt in the center of the tensioner and apply pressure. It is spring loaded. As you apply the pressure it will release the tension on the belt for removal or installation.

Jul 05, 2009 | 2004 Ford Expedition

6 Answers

A high pitched whining noise in the engine.

This Noise Description sounds Indicative of the Sounds that come from the Serpentine Belt Or Related parts such as Belt Idler Pulley or Belt Tentioner witch also has a Pulley, but if Tensioner itself is Literally BROKE I've replaced a number like this it will cause a Whining noise . Best case scenario its just the Belt, and if any of the other Problems turn out to be the Culprit the Belt MUST be Replaced Anyhow as Damage is Being caused By the Very Whining you hear.
PLEASE Spend the Extras $ for the BEST BELT as this Drives your Water pump, Alternator, A/C Compressor, Power Steering Pump All Crucial to Control of, easy Steering ,All Electrical-Power Distribution, The COOLING of Engine << VERY CRITICAL Component
The Pulleys usually have a more Hum type Whining. So I would say at Best The BELT , And WORST Belt Tentioner is Broke

Jan 14, 2009 | 2002 Dodge Caravan

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