[W126 Coupe] 1985 euro version 500 SEC

[jeffrey maniff]

Jim,
Thanks, I appreciate the words of wisdom and I am going to hunt down a 
supplier of R12 and just recharge the existing system but I will replace the 
receiver drier as it should be since I replaced the broken compressor.
Thanks again,
Jeff



>From: jralex at ix.netcom.com
>Reply-To: jralex at ix.netcom.com,Mercedes Coupes Mailing Lists 
><mbcoupes at mbcoupes.com>
>To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>
>Subject: Re: [W126 Coupe] 1985 euro version 500 SEC
>Date: Sun, 3 Sep 2006 02:17:23 -0400 (EDT)
>
>Jeff, I agree with Jonothan. Just recharge with R-12. It cost much more per 
>pound but worth it, all things considered. You already have some mineral 
>oil(petroleum based) throughout your system and that IS to be considered. 
>Most problems with conversions for all cars over the years has been related 
>to a complete lack of knowledge of lubricant compatibility. PAG polyalkene 
>glycol is not compatible with anything at all. Even additives such as 
>antiwear,EP, antifoam etc. cannot be mixed with it. However it is miscible 
>with gases and has a film strength greater than any other so with a 
>completely clean system it will work. Polyolester is also not compatible 
>with petroleum but is used with R134. The high pressure-lowpressure 
>fittings are differant for R134 so they would need to be changed. Our old 
>style hoses will slowly leak the smaller molecule R134.. Best thing to do 
>is replace the dryer, put a vaccum on the system and let R12 back into it 
>at the appropriate weight. Too much or too little is a problem. Just right 
>is the only way to do it. Find a local independent MB tech who does R12. 
>Jim Alexander
>
>-----Original Message-----
> >From: jeffrey maniff <jsman24 at hotmail.com>
> >Sent: Sep 2, 2006 12:58 PM
> >To: mbcoupes at mbcoupes.com
> >Subject: [W126 Coupe] 1985 euro version 500 SEC
> >
> >Help,
> >Does anyone know what the protocol is to convert over a gray market 500 
>sec
> >AC to today's R134.  I replaced the compressor which fits and is working 
>but
> >I have not changed the dryer/receiver or did anything with the pipes but 
>the
> >R134 freon will not no into the system.  DId I forget something?  Also, 
>If I
> >need to change the dryer/Receiver, does anyone know where to get one in a
> >hurry? or even not in a hurry just to get one.  Please help
> >Thanks,
> >Jeff Maniff
> >
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