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

[Pram]

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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