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

[JR]

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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