[s-cars] Adding Freon to 1995 UrS6

[Cody Forbes]

You shouldn't be using Freon, you should be using R134A in that car. I'd be 
rather impressed if you could get Freon, that stuff is hard to come by these 
days.


Ok, I'm aware that I'm being a smart ass here, but it's a major pet peeve of 
mine. Freon is NOT a blanket term for refrigerant. Freon is a trademark 
owned by Du Pont which covers CFC based refrigerants, usually R12 in our 
world. R134A is HFC based, not CFC, and simply has nothing to do with the 
Freon brand. This bothers me even more than the stupid kids that refer to 
any nitrous-oxide related as "NAWS" (NOS) which is again simply a brand name 
used by one company.

Since I got on my soap box I'll at least try to be a little bit helpful. I'm 
not certain where the ports are on an S6, but one thing that may help is the 
line size. The high side is always a smaller tubing diameter than the low 
side. Typically the low side is roughly 3/4" tube and the high side more 
like 3/8". I know on many Audi's, including urS4's and my A8, that there 
isn't a normal low side port, only a high side. The low side pressure 
switch/sensor can be removed (there's a Schrader valve that allows it to be 
removed without refrigerant loss) and an adaptor used to use this as a low 
side port. Fairly likely that you are in the same boat.

-Cody

-----Original Message----- 
From: Jay M
Sent: Friday, July 06, 2012 8:43 PM
To: AudiFans
Cc: quattro at audifans.com
Subject: Adding Freon to 1995 UrS6


Hello all, My 1995 S6 is blowing warm air when AC is on full blast. I hear 
the compressor working but air coming out of vents is not cold at all. I 
suspect the system needs a topping off of R134A freon. Although I have never 
charged the Audi S6 AC system with freon before I know on my other cars it 
is not a difficult task. The problem I have with the S6 is I can't determine 
where exactly the Low side port is located to attach my can of R134a. I did 
research and that indicates the S6 system holds about 1.7 pounds of Freon 
and should be filled to about 50 PSI on the low side when the ambient 
outside temp is 90 degrees. I looked and found an obvious and easily 
accessible port on the passenger side condensing unit located in front of 
the radiator but that seems too good to be true. I also found another port 
tucked away on driver side behind the radiaror. Can anybody tell me with 
100% certainty where the low side port is located so I can attempt to 
recharge my AC system without bl
owing up the can of R134A?  JM
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