[W126 Coupe] AC Problem Part 3

[airedale at sbcglobal.net]

I was wrong on the years!
87 through 89 holds 39 ounces.
90 through 91 holds 46 ounces
No data available to me on earlier years.
John
----- Original Message ----- 
From: "Tom Oelsner" <toelsner at mindspring.com>
To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>
Sent: Tuesday, October 11, 2005 3:12 PM
Subject: RE: [W126 Coupe] AC Problem Part 3


>I charged it.  Again, the system has been working fine for a month.  This 
>is
> something new.
>
> -----Original Message-----
> From: mbcoupes-bounces at mbcoupes.com
> [mailto:mbcoupes-bounces at mbcoupes.com]On Behalf Of
> airedale at sbcglobal.net
> Sent: Tuesday, October 11, 2005 1:10 PM
> To: Mercedes Coupes Mailing Lists
> Subject: Re: [W126 Coupe] AC Problem Part 3
>
>
> Did they charge it too? Why not take it back to them with your complaint?
> John
> ----- Original Message -----
> From: "Tom Oelsner" <toelsner at mindspring.com>
> To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>
> Sent: Tuesday, October 11, 2005 2:56 PM
> Subject: RE: [W126 Coupe] AC Problem Part 3
>
>
>> The system was evacuated by a shop and then had the gauge left in place
>> for
>> several hours to check for leaks.  All clear on that front.  The system 
>> is
>> fully charged.  How does one go about looking for restrictions in the
>> lines?
>> Tom
>>
>> -----Original Message-----
>> From: mbcoupes-bounces at mbcoupes.com
>> [mailto:mbcoupes-bounces at mbcoupes.com]On Behalf Of
>> airedale at sbcglobal.net
>> Sent: Tuesday, October 11, 2005 12:51 PM
>> To: Mercedes Coupes Mailing Lists
>> Subject: Re: [W126 Coupe] AC Problem Part 3
>>
>>
>> Did you do part 1 yourself? If so did you evacuate the system to get the
>> moisture out? If a shop did it take it back to them. To part 3. Is there 
>> a
>> restriction to your condenser or evaporator coil, I have seen items 
>> pulled
>> through the return air that restrict air flow. Under charging will cause
>> the
>> evaporator to freeze up and impair cooling. The usual air that comes
>> through
>> my supply vent in my '91 560SEC on a 90 or so degree day is between 50 
>> and
>> 60 degrees. I notice the AC systems in the 89 through 91 hold more R12
>> than
>> the 86 through 88. I do not know about the models before that.
>> John
>> ----- Original Message -----
>> From: "Tom Oelsner" <toelsner at mindspring.com>
>> To: <mbcoupes at mbcoupes.com>
>> Sent: Tuesday, October 11, 2005 1:32 PM
>> Subject: [W126 Coupe] AC Problem Part 3
>>
>>
>>> ok...here we go again.  Just as a reminder;
>>> Part 1. Get the AC running.  Replaced the compressor O rings, replaced
>>> the
>>> receiver-drier, new AC belt, no leaks at all and rock solid.  Charged 
>>> the
>>> system.  cold air!
>>> Part 2. Belt squeal.  Belt keeps loosening (stretching?). retightened
>>> twice
>>> and loose again even though the idler pulley is tight.  Any ideas?
>>> Jonathan, it is a Continental belt.
>>> Part 3.  THE NEW ONE.  Had very cold air until about a week ago.  Now it
>>> is
>>> only really cold if I am going above 75mph or if the outside temp is
>>> around
>>> 70F.  At lower speeds the air is somewhat cool at best.  Engine temp is
>>> definitely in range  with AC on, 85C to 95C(?) and there is still plenty
>>> of
>>> refrigerant in the system.  Any ideas?  Thanks for your thoughts.
>>>
>>> Tom Oelsner
>>>
>>>
>>> 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 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.