ac recharge port

[David]

What Josh says is true, but there isn't a huge temp change from evap to vent, at least on the typ85. In my case it's 1-1.5*F after extensive testing with a GOOD Thermo. My evap never gets below 32.5*F, even on the "cold spots". But I know people have have their's set so the evap temp actually drops well below 32*F and they have had no freezeups...

Dave
1987 CGT 2.3
SE VA
> 
> From: Joshua van Tol <josh at spiny.com>
> Date: 2005/07/02 Sat PM 04:32:04 EDT
> To: quattro quattro list <quattro at audifans.com>
> Subject: Re: ac recharge port
> 
> 
> On Jun 30, 2005, at 1:45 PM, David wrote:
> > Now that everything is converted, I'd consider adjusting the AC  
> > Temp Sensor (not sure of the large Audis have them, I know the typ  
> > 81 & 85 do). This is the sensor that controls at what temp the  
> > compressor cuts oput. The factory setting is around 42*F. I've  
> > adjsuted mine down to 34*F and am very happy.
> 
> Be aware that if you live in a humid climate 34 degrees F may be too  
> cold. That's the temperature of the air coming out. The actual  
> evaporator surface will be colder. Also, it's not uncommon for a  
> fairly large gradient of temperature to exist across the evap.
> 
> Bottom line, in most cases 34 degrees is too cold to assure that  
> there will not be evaporator freeze up in humid climates. I work for  
> one of the automotive OEMs and believe me, extensive testing is done  
> to set the evap cycle point as cold as possible without risking  
> freeze up. Also the number of cycles per minute of the clutch is  
> fairly important, as it is possible to wear out the clutch with  
> excessive cycling.
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