[W126 Coupe] Another AC Problem

[Tom Oelsner]

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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