[W126 Coupe] Another AC Problem

[mavris2 at comcast.net]

Tom,

I would say if you had too much oil it may be an intermittent problem, thus 
in the long run will kill the compressor. Typically this would be heard at 
start up and may not be present there after. Then when it sits again and the 
oil drains back down, starting it again you may hear the noise after a long 
period of not being used.
  I think in what you are describing sounds like a bad compressor or when 
you replaced the pulley on the compressor its not adjusted right and that is 
what is rubbing.
You could remove the belts and check free spin to see if you can hear 
anything coming from the pulley, but sure sound like bad compressor bearings 
to me.
  That would be my guess based off what you stated.


Jason


----- Original Message ----- 
From: "Tom Oelsner" <toelsner at mindspring.com>
To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>
Sent: Tuesday, September 06, 2005 8:43 AM
Subject: [Norton AntiSpam] RE: RE: [W126 Coupe] Another AC Problem


> 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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