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#4806801 - 07/06/18 01:03 PM Serp Belt Slipping/Chirping
badtlc Offline


Registered: 06/08/06
Posts: 5156
Loc: KC
My 2007 2.3L Escape has an issue where when it is hot outside (90F+), AC is running, car is stopped and transmission is in DRIVE, the belt will start chirping. Put it in neutral OR give it some gas and the chirping stops.

I replaced the belt, idler pulley and tensioner a couple years ago and the slipping had stopped but now it is back. Belt and everything still look new. So, a few things:

1) Is this likely the result of the belt getting soft and stretching a bit?
2) Is there something I could clean or maybe spray on the belt that could help?
3) Could this be harming the compressor?
4) Any suggestions on how to permanently fix this other than throw a new belt on every couple of years?

Thanks.
_________________________
2007 Ford Escape XLS 2.3L ATX, M1 AFE 0W20, Fram TG, 165k+
2015 Chrysler T&C, 75k+, M1 AFE 0W20, Fram TG OF

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#4806811 - 07/06/18 01:17 PM Re: Serp Belt Slipping/Chirping [Re: badtlc]
SilverSnake Offline


Registered: 05/29/13
Posts: 613
Loc: Florida
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#4806821 - 07/06/18 01:30 PM Re: Serp Belt Slipping/Chirping [Re: badtlc]
zrxkawboy Offline


Registered: 11/30/04
Posts: 1770
Loc: SD
NO belt dressing on a serpentine belt! !

What brand of belt did you install? A new Gates gave me the same issue on our van. A Gatorback (now Continental) solved it.
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#4806834 - 07/06/18 01:48 PM Re: Serp Belt Slipping/Chirping [Re: zrxkawboy]
badtlc Offline


Registered: 06/08/06
Posts: 5156
Loc: KC
Originally Posted By: zrxkawboy
NO belt dressing on a serpentine belt! !

What brand of belt did you install? A new Gates gave me the same issue on our van. A Gatorback (now Continental) solved it.


The current belt is a gatorback and if I remember right was the first one to not have the issue when it was new. All others (OEM & gates) slipped from day 1.
_________________________
2007 Ford Escape XLS 2.3L ATX, M1 AFE 0W20, Fram TG, 165k+
2015 Chrysler T&C, 75k+, M1 AFE 0W20, Fram TG OF

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#4806839 - 07/06/18 01:51 PM Re: Serp Belt Slipping/Chirping [Re: badtlc]
Chris142 Offline


Registered: 06/05/03
Posts: 16957
Loc: Deplorable in apple valley, ca
Dayco makes a quiet belt too. Look in the pullys for built up rubber,rocks etc.
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#4806841 - 07/06/18 01:54 PM Re: Serp Belt Slipping/Chirping [Re: badtlc]
Colt45ws Offline


Registered: 08/15/06
Posts: 9681
Loc: Central Washington
Are you SURE its the belt slipping? It seems rather unlikely at idle. I would be looking closer at a bearing in the accessory drive somewhere.
_________________________
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2002 Ford Crown Vic PI 207k, Ex-Kootenai County, ID Unit #42
Down for engine swap
2003 Ford Crown Vic PI 75k
Castrol EDGE HM 5W30, Fram XG2

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#4806842 - 07/06/18 01:55 PM Re: Serp Belt Slipping/Chirping [Re: badtlc]
Boomer Offline


Registered: 09/19/08
Posts: 1941
Loc: Pennsylvania
Bewst solution to this is something I have used with great success on many vehicles over the years. Take a few dabs of SILICONE lubricant grease (dielectric grease will be fine) and gently spread it on sections of the ribbed side of the belt. About three pea sized portions spread around will do just fine. When the engine runs and warms it will distribute evenly on the ribs. This will stop the squeak, NOT cause belt slippage and will not affect longevity of the belt. DO NOT USE petroleum grease or "belt dressing".
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#4806872 - 07/06/18 02:43 PM Re: Serp Belt Slipping/Chirping [Re: badtlc]
Kawiguy454 Offline


Registered: 06/01/15
Posts: 597
Loc: Arizona
+1 something is causing drag on the belt. A worn bearing possibly on the idler pulley, alternator or air pump. Something is resisting turning enough to cause belt slip.

Next time you remove the belt inspect for contamination from oil also and clean the pulley's off if needed.

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#4806896 - 07/06/18 03:19 PM Re: Serp Belt Slipping/Chirping [Re: badtlc]
JMJNet Offline


Registered: 09/06/07
Posts: 950
Loc: TX, USA
Compressor may cause the chirping like an almost seized clutch or the bearing in the clutch is starting to go bad?
Also check other parts attached to the belt like Alternator, etc.
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#4806972 - 07/06/18 05:01 PM Re: Serp Belt Slipping/Chirping [Re: badtlc]
123Saab Offline


Registered: 10/27/10
Posts: 1694
Loc: PA
I never put anything on noisy belts.

http://www.daycoproducts.com/why-belt-dressing-is-not-a-solution-to-quiet-a-noisy-belt

Like others have stated, it's most likely a clutch issue in either the AC or Alternator.

Put a long socket extension against the shell of the compressor and alt and listen.
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#4806991 - 07/06/18 05:22 PM Re: Serp Belt Slipping/Chirping [Re: Chris142]
Trav Offline


Registered: 11/20/06
Posts: 19304
Loc: MA, Mittelfranken.de
Originally Posted By: Chris142
Dayco makes a quiet belt too. Look in the pullys for built up rubber,rocks etc.


The Dayco "W" belt is a very good quiet belt, much better IMHO than the Gatorback which tend to whine.

OP Check belt alignment first with the old belt in place then remove the belt, check the pulleys for smooth operation and play.
Any misalignment must be corrected with shims, flat washers, pully back spacing, etc.

Clean the pulley with with grey Scotchbrite pad and a little dawn liquid in warm water, rinse and blow dry then brake clean spray. Replace the tensioner if old or original, loss of spring pressure is the major contributor to noise and wear.
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#4808852 - 07/09/18 07:38 AM Re: Serp Belt Slipping/Chirping [Re: Colt45ws]
badtlc Offline


Registered: 06/08/06
Posts: 5156
Loc: KC
Originally Posted By: Colt45ws
Are you SURE its the belt slipping? It seems rather unlikely at idle. I would be looking closer at a bearing in the accessory drive somewhere.


Positive. Keep in mind it only happens when all of the following is true:

1) Must be hot outside (90F+ and sunny) and under the hood.
2) The AC must be running
3) The transmission must be in Drive (no noise when unloaded in neutral)
4) Must be stopped holding the vehicle in position with foot on the brake(at stoplight or stop sign)

If any of those things is missing, the noise ins't there. I would have assumed everything was strapped directly to the engine so I don't get why engine loading has an impact on this. I would think this type of noise should happen all the time.


Edited by badtlc (07/09/18 07:57 AM)
_________________________
2007 Ford Escape XLS 2.3L ATX, M1 AFE 0W20, Fram TG, 165k+
2015 Chrysler T&C, 75k+, M1 AFE 0W20, Fram TG OF

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#4808854 - 07/09/18 07:40 AM Re: Serp Belt Slipping/Chirping [Re: JMJNet]
badtlc Offline


Registered: 06/08/06
Posts: 5156
Loc: KC
Originally Posted By: JMJNet
Compressor may cause the chirping like an almost seized clutch or the bearing in the clutch is starting to go bad?
Also check other parts attached to the belt like Alternator, etc.


In addition to the idler pulley and tensioner being new, the alternator and compressor have both been replaced in the last year. Just about everything on the serp belt is new.

It only happens when it is HOT under the hood. Could be related to a grease or something thinning out...frustrating.
_________________________
2007 Ford Escape XLS 2.3L ATX, M1 AFE 0W20, Fram TG, 165k+
2015 Chrysler T&C, 75k+, M1 AFE 0W20, Fram TG OF

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#4808868 - 07/09/18 08:02 AM Re: Serp Belt Slipping/Chirping [Re: badtlc]
NYEngineer Online   content


Registered: 12/12/06
Posts: 1617
Loc: NY, NY
I had a 1998 Yukon years ago that I bought with about 50,000 miles on it. The belt always chirped a little and drove me nuts. I bought a new belt exactly like the one that was on there and it would be quiet for a short time and start the exact same chirping again. Didn't matter if it was Gates, GM or whatever, they all did it.
Finally, I got smart and went to Ernie the counter guy who was very knowledgeable and asked what length belt was SUPPOSED to be on my truck. Low and behold, there were two available. The heavy duty alternator option had a half inch longer belt than the standard one. My truck did not have heavy duty charging but someone had put the belt on and I kept repeating the mistake.
Finally got the right belt and end of problem.

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#4809259 - 07/09/18 01:51 PM Re: Serp Belt Slipping/Chirping [Re: badtlc]
Colt45ws Offline


Registered: 08/15/06
Posts: 9681
Loc: Central Washington
Originally Posted By: badtlc
Originally Posted By: Colt45ws
Are you SURE its the belt slipping? It seems rather unlikely at idle. I would be looking closer at a bearing in the accessory drive somewhere.


Positive. Keep in mind it only happens when all of the following is true:

1) Must be hot outside (90F+ and sunny) and under the hood.
2) The AC must be running
3) The transmission must be in Drive (no noise when unloaded in neutral)
4) Must be stopped holding the vehicle in position with foot on the brake(at stoplight or stop sign)

If any of those things is missing, the noise ins't there. I would have assumed everything was strapped directly to the engine so I don't get why engine loading has an impact on this. I would think this type of noise should happen all the time.

Okay, I just ask because I watched a compressor that was spinning lock right up in front of my eyes, and the compressor clutch began to smoke rather than the belt slipping over the compressor pulley, so it seems it takes a lot to get a serpentine to actually slip.
_________________________
-Colton
2002 Ford Crown Vic PI 207k, Ex-Kootenai County, ID Unit #42
Down for engine swap
2003 Ford Crown Vic PI 75k
Castrol EDGE HM 5W30, Fram XG2

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