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

[Jerry Scott]

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
>>>
>>>
>>>_______________________________________________
>>>S-CAR-List mailing list
>>>S-CAR-List at audifans.com
>>>http://www.audifans.com/mailman/listinfo/s-car-list
>>>
>>>      
>>>
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>>
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