[W126 Coupe] Air conditioning Issues

[Bill Reford]

Hi Group,

I'm up here in Canada (Toronto) where we get only a few days a year above 95
degrees, but many between 80-90 with lots of humidity.

I changed from R12 to 134A 5 years ago on my 1985 500 SEC Euro with good
success.

I had to evacuate and recharge the system this year (5 years later) because,
as it was explained to me, "the molecules in 134A are much smaller than
R12", therefore over time the Freon has to be replaced as it will leak very
slowly out of the system. My system has been checked for leaks using a dye,
and none were found.

The system now blows ice cold.

Also, the sealers (additives) that are on the market cause more problems
than they solve, as per MB Canada.

Bill.
----- Original Message ----- 
From: "Iain Gunn" <igunn at bmts.com>
To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>
Sent: Saturday, August 12, 2006 2:59 PM
Subject: Re: [W126 Coupe] Air conditioning Issues


> I have been using Duracool for about 4 years now and have no complaints, I
> have also filled probably 2 dozen a/c systems with it in that same time
with
> no complaints. My 86 560 SEL was converted to 134 when B4 bought it and
has
> worked fine for the last 5 years. Surprisingly I have never had to mess
with
> it. My 90 190E 2.6, I topped up this year with Duracool, works fine. The
86
> 560 SEC Koineg was converted to Duracool. and worked fine for the 3 years
I
> had the car B4 I sold it.
> Duracool Does NOT contain any 134.
>                                                                 Cheers,
Iain
>
>  Some thoughts on the MB AC Freon issues that I thought I'd pass along.
> > Just yesterday, I stopped to discuss the seemingly long waiting period
for
> > my '90 SEC to cool down at 95 to 98 degrees ambient outside temp.with an
> > A.C. specialist that works on my classic American cars very
> > satisfactorily.  My system is fine, he says it just takes a little
longer
> > in these hot days and I need to be patient especially when the humidity
is
> > high but what he did point out very strongly was "Do not change this
R-12
> > Freon to R-134 or Freeze 12.(Freeze 12 contains 80% 134) Suck up the
cost
> > of R-12 @$40 a pound". He suggested that I find R 12 at swap meets and
> > stock pile it if I'm going to keep the SEC
> >
> > He told me that he has changed the products at the request of  mid '80s
to
> > early '90s MB owners (under protest) and to a person, they have come
back
> > dissatisfied with the cooling capabilities of their cars.  He has
> > converted my '64 Impala SS and my '71 442 convertible to R134 and they
> > work fine and he agrees that  they should but the MBs just don't react
the
> > same. He does not have an explanation why . If others have made the
change
> > successfully, I'd be interested as a general education point in the
event
> > I need to consider this in spite Neils advice.
> >
> > Doug
> > The MB Coupes Website!
> > W126 SEC Mailing List
> > Postings remain property of MB Coupes, L.L.C.
> >
> >
> >
> > -- 
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8/11/2006
> >
> >
>
> The MB Coupes Website!
> W126 SEC Mailing List
> Postings remain property of MB Coupes, L.L.C.
>
>
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