[W126 Coupe] Another AC Problem

[Mister McGoo]

Use a bar of hand soap to rub on the surfaces of the belts and see if the 
noise changes or disappears.  Worn belts, not necessarily LOOKING bad, can 
make a whole range of weird noises including mimicking main bearings shot.  
Treat one belt at a time to identify which one(s)

If you haven't already eliminated this, try it.  It costs nothing.

-Bellamy




>From: "Tom Oelsner" <toelsner at mindspring.com>
>Reply-To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>
>To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>
>Subject: RE: RE: [W126 Coupe] Another AC Problem
>Date: Tue, 6 Sep 2005 07:43:50 -0700
>
>Jason,
>There is definitely not 2 different sets of noises, only 1 which keeps the
>same pitch regardless of speed.  Given that the compressor has not
>historically made noise, is it possible that it should all of a sudden have
>too much oil in the system?
>
>How much deflection should I see in the belt to determine if it is loose?
>Tom
>
>-----Original Message-----
>From: mbcoupes-bounces at mbcoupes.com
>[mailto:mbcoupes-bounces at mbcoupes.com]On Behalf Of mavris2 at comcast.net
>Sent: Tuesday, September 06, 2005 6:23 AM
>To: Mercedes Coupes Mailing Lists
>Subject: Re: RE: [W126 Coupe] Another AC Problem
>
>
>Tom,
>
>It could be one that you have too much oil in the system.  Yes, it will 
>cool
>but it may make a horrible noise and possible with higher rpm make a
>screeching noise like bearings.  If your getting two different set of 
>noises
>then your compressor is shot its way to death.
>
>Jason
>
>----- Original Message -----
>From: "Tom Oelsner" <toelsner at mindspring.com>
>To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>
>Sent: Monday, September 05, 2005 10:19 PM
>Subject: [Norton AntiSpam] RE: [W126 Coupe] Another AC Problem
>
>
> > No, it isn't a grinding noise.  Now that I reflect on it, I do not think
> > it
> > is from the belt.  It is definitely rotation related as the noise
> > increases
> > in speed with acceleration.
> > Tom
> >
> > -----Original Message-----
> > From: mbcoupes-bounces at mbcoupes.com
> > [mailto:mbcoupes-bounces at mbcoupes.com]On Behalf Of Shayegan, Richard
> > Sent: Monday, September 05, 2005 8:32 PM
> > To: Mercedes Coupes Mailing Lists
> > Subject: RE: [W126 Coupe] Another AC Problem
> >
> >
> > Is it like a grinding noise? I started getting that in my system which
> > has Freeze 12 in it, though I don't know if that's the culprit since it
> > hadn't worked for 7 years prior. The mechanic said if it still blows
> > cold not to worry about it.
> > Richard
> >
> > -----Original Message-----
> > From: mbcoupes-bounces at mbcoupes.com
> > [mailto:mbcoupes-bounces at mbcoupes.com] On Behalf Of Tom Oelsner
> > Sent: Monday, September 05, 2005 11:28 PM
> > To: mbcoupes at mbcoupes.com
> > Subject: [W126 Coupe] Another AC Problem
> >
> > A couple of weeks ago, with the help of a number of people here
> > providing
> > information, I got my AC running again.  I replaced the O rings behind
> > the
> > compressor and evacuated it (held pressure perfectly), replaced a seized
> > AC
> > idler pulley and recharged the system using Duracool.  The system has
> > been
> > running perfectly, until today.  I have put about a 1,000 miles on the
> > car
> > in the last 2 weeks, about 500 in the last 2 days.  Today, I started
> > hearing
> > sounds as if bearings are going (or almost like a belt is slipping) but
> > the
> > AC is still blowing very cold.  I am not convinced that it is a slipping
> > belt because it only happens when the AC is turned on.  Has anybody
> > experienced this before or have any suggestions for isolating and
> > identifying the problem?
> >
> > Tom Oelsner
> > 560SEC
> >
> >
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> >
> >
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> >
>
>
>The MB Coupes Website!
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>Postings remain property of MB Coupes, L.L.C.
>
>
>The MB Coupes Website!
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>Postings remain property of MB Coupes, L.L.C.