[W126 Coupe] Refrigerant info

[Richard Hogarth]

AC info.
You may find that this link has helpful information on oils and conversions.
http://yarchive.net/ac/oils.html

http://fire.nist.gov/bfrlpubs/build04/PDF/b04025.pdf

Procedures:
http://www.sanden.com/support/RETRO.html

http://www.copeland-corp.com/co/images/9304.PDF


I'm running R134 in my '91 560. 
I live in Louisiana and it gets damn hot down here.
On the hwy the AC cools great. Around town it just cools
But it does not blow 'cold cold'.
I've converted 4 of my other vehicles over the past several year, 
-2 Gm pickups with A6 compressors, '85 RX-7, Ford Taurus. 
I've found that converted systems are
Very sensitive to minor changes in amount of Freon in the system.
For R134 to cool more efficiently, it requires a condenser coil with
Larger diameter tubes so converted R12 systems will never be as cold
As an original R134 system. 
Good luck. 
-axlehead at bellsouth.net 
 

-----Original Message-----
From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]
On Behalf Of airedale at sbcglobal.net
Sent: Thursday, August 11, 2005 12:39 AM
To: figstir at yahoo.com; Mercedes Coupes Mailing Lists
Subject: Re: [W126 Coupe] Air Conditioning

Probably first you should find out if it is out of Freon. Maybe something
else is wrong. Then if it is you need to find the leak and repair it before
putting more of any kind of gas in. R-12 is readily available and delivers
more cold than R-134. If yours is a 87 to 89 it has less gas capacity than
the 90 to 91 anyway by about 15% and I believe you would uncomfortably
reduce the performance of the AC system using R-134.
John.
----- Original Message -----
From: "a figment of the imagination" <figstir at yahoo.com>
To: <mbcoupes at mbcoupes.com>
Sent: Wednesday, August 10, 2005 7:33 PM
Subject: [W126 Coupe] Air Conditioning


> Hi all,
>
> It is hot as heck where I live. My A/C blows out hot air that's hotter 
> than the air outside. So...
>
> Has anyone been able to successfully convert their A/C system on their 
> SEC to use RF134 instead of the RF12 refrigerant?
>
> If so, can a simple $50 kit at say Autozone or O'Reilly's do it?
>
> A MBZ salvage yard owner told me that if you inject
> RF134 into a MBZ A/C system, after flushing the RF12 out, that the 
> pressure from the RF134 would be so high that it will blow all the 
> seals, damage the condenser, expansion valve, etc....  (true/false?)
>
> However, someone else told me that this is not true and did the 
> conversion himself on his car.  However, this person owns a Buick, so 
> that opens up the question, even though he supposedly has a license 
> for A/C work and was confident of his knowledge.
>
> Any recommendations?
>
> Thank ya!
>
> -Figment
>
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