[W126 Coupe] AC Problem Part 3

[Tom Oelsner]

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
>
>
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