[W126 Coupe] Another AC Problem

[Markus Meyer]

 Tom, In general belts shouldn't "move" much more than 1/2 an inch or so when you push down on them.  You don't want them too tight or too loose. Out of curiosity, how do you know the idler pulley was seized?  Unfortunately this sounds all too similar to an ordeal I had, I can tell you offline how it got resolved in the end and what the problem was if you are interested. Markus--- On Tue 09/06, Tom Oelsner < toelsner at mindspring.com > wrote:From: Tom Oelsner [mailto: toelsner at mindspring.com]To: mbcoupes at mbcoupes.comDate: Tue, 6 Sep 2005 07:43:50 -0700Subject: RE: RE: [W126 Coupe] Another AC ProblemJason,There is definitely not 2 different sets of noises, only 1 which keeps thesame pitch regardless of speed. Given that the compressor has nothistorically made noise, is it possible that it should all of a sudden havetoo 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.netSent: Tuesday, September 06, 2005 6:23 AMTo: Mercedes Coupes Mailing ListsSubject: Re: RE: [W126 Coupe] Another AC ProblemTom,It could be one that you have too much oil in the system. Yes, it will coolbut it may make a horrible noise and possible with higher rpm make ascreeching noise like bearings. If your getting two different set of noisesthen your compressor is shot its way to death.Jason----- Original Message -----From: "Tom Oelsner" To: "Mercedes Coupes Mailing Lists" Sent: Monday, September 05, 2005 10:19 PMSubject: [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>>> The MB Coupes Website!> W126 SEC Mailing List> Postings remain property of MB Coupes, L.L.C.> The MB Coupes Website!> W126 SEC Mailing List> Postings remain property of MB Coupes, L.L.C.>>> The MB Coupes Website!> W126 SEC Mailing List> Postings remain property of MB Coupes, L.L.C.>The MB Coupes Website!W126 SEC Mailing 
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