[s-cars] Adding Freon to 1995 UrS6

[Huw Powell]

I think the right way to do it is to hook it up a machine, evacuate it, 
and refill it with the correct amount of freezant(R), along with some 
dye so the leak(s) can be found later.

There's no other way to make sure it has the right amount of freezant(R) 
in it.

On 7/6/2012 9:12 PM, Cody Forbes wrote:
> 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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-- 
Huw Powell

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