[V6-12v] ac refrigerant question

[Edward Sluis]

Just a quick check, I'm not an Audi engineer, but I am an engineer and I'm
just wondering:  You said that charging is suppose to be done through the
high pressure port, as far as my knowledge of HVAC systems goes it is only
recommended to charge through the high side with an approved charging
station with the system off and then topping it off on the low side with the
system on.  If you're a do it yourselfer using the cans, your better off
charging on the low side.  I may be wrong but that's what my experience on
the design side of things seems to make me think.

-----Original Message-----
From: v6-12v-bounces at audifans.com [mailto:v6-12v-bounces at audifans.com] On
Behalf Of Elliott Potter
Sent: Tuesday, March 30, 2004 6:58 PM
To: Jack Tozzi at Novi Cantori
Cc: v6-12v at audifans.com
Subject: Re: [V6-12v] ac refrigerant question

On Tue, 30 Mar 2004, Jack Tozzi at Novi Cantori wrote:

> Hello All,
>
> The AC in my 1995 Audi 90 is not delivering cool air this spring.  I
haven't
> done any troubleshooting to speak of but I can say that the compressor is
> not engaging when I hit the AC switch. This makes me suspect the low
> pressure switch is being tripped.

Very often under a low pressure condition the compressor will cycle on
and off at least once when you turn it on, unless the pressure is
*really* low.  You don't happen to have the automatic climate control
(as opposed to the three knob system), do you?

> My dilemma is I'm not sure which refrigerant the car is using.  It was
built
> in 06/94 but was in an front end accident prior to my purchasing the car
in
> 2001.  Because of the accident, the condensor has been replaced and I
can't
> find any other place where the refrigerant type is listed.  It seems very
> likely to me that the car has to have 134a because parts of the system was
> rebuilt because of the accident, but I'd obviously like to avoid
> contaminating the system by adding the wrong refrigerant.
>
> So, does anyone know for sure what the car originally came with?  Bentley
> was no help, it simply provided service info for both systems.

Audi changed to 134a in October 1992, so you're sure to have
R134a.  There should be a silver sticker on the back of the hood, on the
passenger's side that says so.

There's also no easily-accessible low-pressure port on the R134a
systems; charging is supposed to be done through the high-pressure port
on the front of the condenser.
--
Elliott
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