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Belt Noise

5 messages,  Last post on Jun 26, 2012 at 1:18 PM

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#1 of 5 Belt Noise by urban23496

Jul 15, 2010 (7:39 pm)

I have a 1999 Chrysler Town and Country 3.3L. I have replaced the water pump, alternator, belt tensioner, idler pulley, and have put on about 4 new belts throughout the years. I've been having problems locating where the noise is coming from and what is causing it. Here is a youtube video i have recorded to show you the sound the van is making. Any help is appreciated Thank You
http://www.youtube.com/watch?v=a2w8wrl323I

#2 of 5 Re: Belt Noise [urban23496] by seer1

Jun 25, 2012 (6:55 pm)

Replying to: urban23496 (Jul 15, 2010 7:39 pm)
Urban
 
I have a noise in my '99 Chrysler T&C that sounds as though it is identical to yours.
 
I just bought it two months ago, with 107k miles on it. The dealer/mechanic had searched, and to continued to search for the source of the problem,without any success. He replaced rotating under the hood parts, to no avail.
 
I have tentatively reached the conclusion that it is the motor, bogging down under heavy load, at idle speed, such as turning on the A/C. If so, I fear it could be damaging the motor. However, the dealer told me the previous owners, personal friends of his, say the problem is some five years running (no pun intended).
 
Engine idle speed is 600, maybe plus, RPM. Increasing it seems to stop the noise immediately. Don't hear it driving; don't hear it at a traffic light. Only hear it when first starting up and turning on A/C. Increasing engine speed stops the noise. Letting off the gas, it may or maynot return. Some days it is worse than others. I can find no consistent pattern for it.
 
I'm told idle speed is computer controlled, and not adjustable.
 
Would like to have some input on this, as I feel the problem needs to be solved quickly.
 
TIA to all respondents.

#3 of 5 Re: Belt Noise [seer1] by urban23496

Jun 25, 2012 (7:47 pm)

Replying to: seer1 (Jun 25, 2012 6:55 pm)
Hi there, i have came to a conclusion that it was my alternator. I had it replaced once with a refurbished one and the problem was still there. But after some research i read that the bearing are not always replaced when the alternators get rebuilt so when i got my refurbished one, it so happened that those bearings were shot just like my orignal. Soo after swapping out my alternator again, it is nice and quiet. The reason your van makes that noise when the ac is on is because the ac puts stress on the belt and bearings, therfore causing them to squeal if they are bad. I dont believe the engine is at fault at all, it should be okay. I hope this helps

#4 of 5 Re: Belt Noise [urban23496] by seer1

Jun 26, 2012 (6:43 am)

Replying to: urban23496 (Jun 25, 2012 7:47 pm)
Thanks for that insight. The noise gets so loud at times, I wonder how a bearing could produce it...but...I will run this info by my mechanic and see what we can come up with. Thanks again!

#5 of 5 Re: Belt Noise [seer1] by urban23496

Jun 26, 2012 (1:18 pm)

Replying to: seer1 (Jun 26, 2012 6:43 am)
Okay let me know what he says, sometimes its the harmonic balencer that goes too.

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