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

[Pram]

What is a Freeze 12.  It is a R12 alternate.  The AC shop that I go,  
strongly cautioned me from using any kind of alternate.  He said that  
he can easily get R12 and charged me $40/lb.  He warned me that using  
alternate might damage the system and if it  does the repair bill is  
just much much higher.  Basically what he is saying is that there are  
several alternate but the known and really tested one is the R12.

HTH,
Pram


On Jul 27, 2006, at 5:15 PM, Lino M. Valadas wrote:

> 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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