[W126 Coupe] Air conditioning Issues

[Doug Gavin]

Calvin Young wrote:

>I would appreciate some help on my Air Conditioning.  I evacuated the system
>and installed an alternative to Freon, but the system still is not cooling.
>Initially I got some cooling, but system does not work like it is supposed
>to.  Any suggestions?
>
>A mechanic I spoke with mentioned that the system orifice tube is probably
>clogged except I read in the archives that the MB system does not have one.
>I read  a post from Satish, Sat Apr 17 1999 - 23:41:34 EDT, that suggested
>procedures that I do not really feel qualified to make since I do not know
>where some of the parts are located.  Does anyone have the written
>procedures he referred to that would appear in the Star?  Are there pictures
>attached?  If so, I would like to obtain a copy.  
>
>Any other help would be appreciated.  Good news is that I evacuated the
>system and there does not seem to be a leak.  Recharge of system simply does
>not improve system. 
>
>I am working on my 83 SEC, but the 86 has similar issues, only not as bad
>even though the systems does have leaks that I need to repair.  I really
>would like to do this right.
>
>Cal
>
>
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>
>  
>
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