[s-cars] A/C strength, 93 S4

[Lino M. Valadas]

Yes,  There's a valve at the compressor and another behind the fire wall
that's what my AC guy used to refill my system with, wait for it, Freeze 12.

Lino

93 CND S4


----- Original Message ----- 
From: "Jerry Scott" <jerryscott at wispertel.net>
To: "s-car-list" <s-car-list at audifans.com>; "Pramuditya Oen"
<PramTT at pacbell.net>
Sent: Thursday, July 27, 2006 5:01 PM
Subject: Re: [s-cars] A/C strength, 93 S4


Pram
I assume that you have a R12 system.  Did the mechanic have a fitting
that would connect to the schrader valve?  What was the effect of
jumping the pressure switch?  Was the car running or stopped when
recharging the system?  Isn't there also a port at the compressor? Was
this an Audi dealer or an A/C specialty shop?
Thanks
Jerry

Pram wrote:

>JR:
>
>Just to add to my earlier response about the low freon.
>
>I have a 92S4.  Back in 1997 my S4 started to have the recirc button
>kept going off.  My trusty Audi mechanic right  away told me to add
>Freon and that solve the problem right away.  Then in 2004 it started
>with the same symptom again but I was too lazy to add Freon since I
>do not use AC that often.  Well this summer (2006) the weather got
>really hot here in So Cal that when I turn on my AC the compressor
>kept recycling every 15-25 secs  (Recirc button does not even engange).
>
>I took it for a freon recharge and now the AC is cool and everything
>is working like normal (including the recirc button).
>
>Just be cautious when you take your car to the AC guy since on my
>92S4, there is only one port for the Freon (most car has two port,
>high side and low side).
>
>The port is located between the firewall and the front windshield
>(passenger side).  You have to unscrew the pressure sensor and there
>will be the port with schrader type valve.  Since you only have only
>have one port, the proper way to accurately recharge the AC is for
>the AC technician to suck (vacumm) all the Freon from the system and
>add about 1100±100gr of freon.  Plus you need to put a jumper on the
>pressure sensor while charging.
>
>Some AC technician will simply add freon from that single port but it
>is going to be difficult to know it is too much or too little having
>only one port.
>
>HTH,
>Pram
>92S4
>
>
>On Jul 26, 2006, at 9:06 AM, JR wrote:
>
>
>
>>What does it mean when the compressor seems to cycle on and off  every
>>few seconds or so?  Also, when I press recirc, it just shuts recirc
>>right back off immediately.  It will not stay on recirc.
>>
>>JR
>>
>>
>>
>>Ernest Seow wrote:
>>
>>
>>>The key to good AC is make sure you have sufficient high side
>>>pressure when
>>>you know the system is fully charged. If the low side is too low
>>>and the
>>>highside is too high with the correct charge, then replace the
>>>orifice tube
>>>if you haven't already done so. Its the cheapest part. They tend
>>>to clog as
>>>the car get older from normal debris wear from the compressors. Also
>>>replacing the accumulator will help also. An old accumulator that is
>>>saturated will tend to drop efficiency. Over time, moisture still
>>>gets into
>>>the system from the rubber hoses, thats why most AC shop replace
>>>them. Also
>>>make sure your system is running on recirc, and not fresh air, so
>>>check the
>>>flap to make sure it operating. When ambient temps rise above 80+
>>>deg, the
>>>cooling temp will rise also. There is a chart to check this with
>>>Audi/VW
>>>vehicles. The design drawback of the UrS4/S6 AC is that the AC
>>>system is
>>>placed outside in the plenum, not inside under the dash like newer
>>>vehicles,
>>>so also makes the AC not as cool. I might attempt insulating my AC
>>>casings
>>>as its very hot and humid here in Florida.
>>>Rgeards,
>>>Ernest
>>>
>>>
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>>>
>>>
>>>
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>
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