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Old 01-11-2015, 06:44 PM
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Strange noise: whistle/whining sound

2001 SE 2.5L

Started it the other day, it was 0 degrees out, and an odd high pitch whine started. Sounds like a whistle but is not, because it can happen not moving.

It mostly happens when on the throttle, but can happen when off the throttle. It doesnt seem to happen in neutral though (although I dont ride around in neutral while revving, so, that might not mean much). It also seems to be coming from the passenger side.

This started in extreme cold, and its been pretty cold since. However I strangely noticed it is louder the colder it is out (and engine temp doesnt matter).

Any ideas?
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Old 01-11-2015, 07:05 PM   #2
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Does it change when the Jeep it warms up?

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Old 01-11-2015, 07:06 PM   #3
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Sorry I saw just reread your post. Temp doesn't matter...
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Old 01-11-2015, 07:07 PM   #4
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How are your fluid levels? Transmission and/or oil
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Old 01-11-2015, 07:31 PM
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Its a stick so no tranny fluid to check, but I will check the oil when I head out in the AM
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Old 01-11-2015, 09:18 PM   #6
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Is it 4 wheel drive? Have you noticed any puddles under the jeep. If so...Look for leaks around the front axel near the diff and or the transfercase. I had a nissan titan that had a simular problem. I had a leaky seal on the transfer case had to change out a bad bearing.

Does the noise change when you turn the steering wheel? It could be low power steering fluid too. That usually makes a different noise.

Being in cold weather it could also be a bad water pump. Does the engine run hot? While your at it check your water level in your radiator.

I'll talk to a mechanic friend tommorow.
Best of luck... maybe it'll be gone in the morning.
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Old 01-11-2015, 11:16 PM   #7
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Mine does something similar and It is my alternator as far as I can tell mine started this last year when it got about -15 out but it started with I high pitched squeal and ever since then it is just a low whistling sound when it gets below about 15 out. I've been meaning to swap it out just havn't had the time yet not when I do it's not on the top of my priority list as it hasn't failed on me yet
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Old 01-12-2015, 05:40 AM   #8
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Good idea

Quote:
Originally Posted by k.j.b. View Post
Mine does something similar and It is my alternator as far as I can tell mine started this last year when it got about -15 out but it started with I high pitched squeal and ever since then it is just a low whistling sound when it gets below about 15 out. I've been meaning to swap it out just havn't had the time yet not when I do it's not on the top of my priority list as it hasn't failed on me yet
That's a definite possibility. If it's either the water pump or the alternator you should be able to pop the hood and hear it coming from the front of the motor.
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Old 01-12-2015, 06:51 AM
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Oil level was fine. No puddles underneath.

I started to think either the belt or a pulley, so water pump or alternator might be it. I'll check water level tonight.
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Old 01-12-2015, 07:29 AM   #10
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Mine does the same thing, Engines do not like 0 outside. Never popped my hood to find out what the noise is. I assume that it is one of the bearings in the alt, AC, or power steering. I think if I spent the night outside at 0 I would make some noise to when I had to move...
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Old 01-12-2015, 08:34 AM   #11
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Cold weather stincks!!!

Quote:
Originally Posted by jeremyh172 View Post
Mine does the same thing, Engines do not like 0 outside. Never popped my hood to find out what the noise is. I assume that it is one of the bearings in the alt, AC, or power steering. I think if I spent the night outside at 0 I would make some noise to when I had to move...
That is true. Heck it's 40* and raining here in East Tennessee you should have heard some of the noises I was making running to my classroom.
Being that it's a 2001 the lube in any of those parts could be a little caked and could cause it to wine at 0* temps. I would add that it could also be idler/Tensioner arm pulley.
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Old 01-12-2015, 04:41 PM
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If anyone knows anything more I should be concerned about, please chime in.

But it's 37 degrees now, and no noise. I'll keep an eye on it and will replace the belt sooner than later.
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Old 01-12-2015, 08:32 PM   #13
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Man that's GREAT news!!! Cold weather just Stinks! It's rigs like yours that make me proud to own a Jeep. The weather you get is 10 times more extreme than what we get. You really have an awesome ride! Sorry you had to go through the stress. I wish you the best of luck. If your ever in Tennessee send a PM.

See you on the trail,
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Old 01-13-2015, 04:26 AM   #14
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Check your intake manifold gasket if all your other checks don't come up with anything. They whistle when they suck air, and throttle position can make the sound change or go away. Spray some starting fluid or something around it with the engine idling and see if your RPM's change. I was sure mine was a belt or a pulley, but it was that.
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Old 01-13-2015, 06:39 AM   #15
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Quote:
Originally Posted by Airtight View Post
Check your intake manifold gasket if all your other checks don't come up with anything. They whistle when they suck air, and throttle position can make the sound change or go away. Spray some starting fluid or something around it with the engine idling and see if your RPM's change. I was sure mine was a belt or a pulley, but it was that.
I'm going to have to look at that on mine I've now developed a whistling that almost sounds like a electric motor while driving
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Old 01-13-2015, 07:40 AM   #16
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Same here, today it was 33 when I left for work. Not one noise from under the hood, I even waited to hear something so I could post what I found. Sometimes the cold just brings out the gremlin's in things.
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Old 01-13-2015, 08:53 AM   #17
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FWIW I had a water pump fail...sounded like you describe. Easy to replace.
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Old 01-13-2015, 09:01 AM   #18
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Developed a similar sound as well on Sunday. Its been there the last two days now but disappears when I get up to temp. I popped the hood and it seems to be coming from my alternator. We are forecasted with high 50s later this week so I will start poking around and let you guys know what I find.
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Old 01-13-2015, 12:21 PM   #19
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My son's 2005 TJ had a similar issue a year or two ago. We replaced the belt and belt tensioner. Problem solved.
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Old 01-14-2015, 08:32 AM   #20
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I'm having the same problem. I replaced the belt and tensioner and it is still whining. Oddly, it does go away after the engine is good and warm. Anymore suggestions on what to check?
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Old 01-14-2015, 09:30 AM   #21
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Mine started making a whistle noise now also.. really the first time its been out in the sub freezing temps of Ohio and it does sound like alternator, A/C or PS pump bearings.
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Old 01-19-2015, 02:10 PM   #22
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I've had the whistle for about 3 winters now. Last winter I changed out the water pump (because it was failing) but the whistle remained...... It does however go away during the summer.
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Old 01-19-2015, 02:16 PM   #23
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My whine was coming from the idle pulley. Replaced it and so far no whine.
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Old 01-26-2015, 08:04 PM   #24
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I have a chirping noise that sounds like it's coming from the power steering pump pulley. It gets louder when accelerating. Will replacing the pulley fix this or is there a bearing that needs to be replaced within the pump, or do I have to replace the entire steering pump and pulley?
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Old 01-26-2015, 08:21 PM   #25
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Do you have a cold air intake with a K&N air filter? I have this set up on my 01 TJ and it as well has a load whistle but it is due to the higher volume of air that it sucks in and the colder temps make the air thinner and cleaner. Hope this is some help and another thought is if you're running a stock breather box it could have a crack ( something to check )
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Old 01-26-2015, 08:43 PM   #26
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Thanks, I do have an after market K&N filter, but it's definitely a "chirp, chirp, chirp" that speeds up when accelerating and I'm pretty certain it's coming from the power steering pump pulley (I'm a newbie here). I would like to get it fixed.
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Old 01-26-2015, 08:51 PM   #27
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Ok some old mechanics have shown me this. May sound crazy but give it a try. Take a piece of one inch pipe ( about 2 to 2 1/2 foot long ) and place one end on want your think is making the noise and the other to your ear you can some time pin point what it is like a bearing or what not just stay clear of the fan
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Old 01-27-2015, 01:32 PM   #28
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Quote:
Originally Posted by Crewsuper View Post
Ok some old mechanics have shown me this. May sound crazy but give it a try. Take a piece of one inch pipe ( about 2 to 2 1/2 foot long ) and place one end on want your think is making the noise and the other to your ear you can some time pin point what it is like a bearing or what not just stay clear of the fan
The guy who was trying to figure out where my whine was coming from used his screwdriver and put his ear to it. So there is differently truth in that.
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Old 02-10-2015, 03:56 PM   #29
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$10 USD for a mechanics Stethoscope. I had the same noises. Replaced the idler pulley, adjusting pulley (Because I had 140k on the clock). PS is the source of the noise but have not found any articles to replace the bearings (if there are any) in the PS pump. I have no leaks but, at $38 bucks, replacing the PS pump.

Be methodical, first: use some WD 40 on the bearing shafts of the PS pump, then the Water Pump, then the alternator. If you hear a difference in the tone, you found your problem. Good hunting...
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Old 04-04-2015, 08:47 PM   #30
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Could the whistle sound be caused by a bad or dirty idle air control valve?I cleaned it and it
seemed to help. The sound seems to go away at 200 degrees.

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