4k/CGT/Urq owners! Get you A/C ICE cold!!! (long)
Dave Aukerman
aukdav at ccsdana.net
Tue Jun 24 10:17:07 EDT 2003
Is there a corresponding adjustment screw on the type44's? Would love to
get a few more degrees of drop after the 134A convert a few years back.
Dave
----- Original Message -----
From: "Roa, Greg" <Greg.Roa at Cinergy.COM>
To: <quattro at audifans.com>; <duandcc_forums at cox.net>
Sent: Tuesday, June 24, 2003 9:04 AM
Subject: RE: 4k/CGT/Urq owners! Get you A/C ICE cold!!! (long)
Well, I have been watching this on the Audiworld forums since I saw David
mention it here, and had been meaning to do this. After he mentioned that
it worked out well for him, I thought I'd give it a shot.
I took my glovebox out last night, and gave the screw a half turn. My temps
had been around 51 or so, after a few minutes (134a converted, new dryer,
exp valve, and a compressor I resealed). With a half turn, my vent temps
dropped to about 48.
Went back and gave it another 3/4 turn. Went for a drive then, and my vent
temps were fluctuating between 38 and 41 degrees. I was tempted to leave it
there, but the compressor was running at nearly 100% duty cycle during lower
speed driving, so I backed it out a bit. I've now got temps hanging around
45 degrees, which makes the car nice and chilly.
I had figured something wasn't right as my compressor would run for about 20
seconds, and stay off for 45 seconds or more, even when starting to cool
down. Now, it tends to run much longer after starting the A/C, making
cooldown take much less time.
More testing will follow this afternoon, as temps are supposed to be around
93F, and humid here. To note, I was driving around 40mph, through varying
terrain after adjusting the car, and cooldown was very quick. Didn't
measure how long it took to attain max cooling, but I'll do that today,
using highway driving on the trip home from work.
I'm kind of suprised that the bentley makes no mention of this adjustment
screw in the sections devoted to A/C. Good tip, and well worth the time it
takes to do.
Good Luck!
Greg Roa
Cincinnati, OH
86' 4kcsq << Needs a front leather seat bottom. Got one?
93' 90 CS
83' 944
>From: David <duandcc_forums at cox.net>
>To: quattro at audifans.com
>Subject: 4k/CGT/Urq owners! Get you A/C ICE cold!!! (long)
>Date: Mon, 23 Jun 2003 8:26:36 -0400
>
>Well, this is definitely one for the archives. Are you a 4000, Coupe GT or
=
>Urq owner who is frustrated by your A/C system? Does it take forever to
get=
> cold? Or never gets REALLY cold despite being in perfect working order?
We=
>ll, there's the anser! Adjust your A/C temperature sensor! My CGT was
conve=
>rted to R134a. I have no idea how well it worked with R12 as the AC was
dea=
>d when I got the car, but with R134a on a hot sunny day, it took at least
1=
>0 minutes for vent temps to get down to even 60*F, sometime longer. It
woul=
>d bottom out around 50*F after about 1/2 hour, and if you stopped the
engin=
>e for more than a minute or two it would take for ever to get cold again.
T=
>he system was in perfect order with proper pressures. I had just fgured
tha=
>t this was the price for admission to the R134a crowd. Boy was I wrong, a
q=
>uick adjustment of the AC temp sensor an it works like it should have all
a=
>long. Now, on a bright sunny day, vent temps hit 56*F within 3 minutes,
50*=
>F within 4, and it bottoms out at 40*F in city driving and 38*F on the
high=
>way in less than 10 minutes! So I figiured I'd better pass this along with
=
>instructions (care of Todd Miller on AudiWorld):
>
>The temp sensor is just to the right of the evaporator. So, remove the
glo=
>ve box to get to it. Remove the 14mm nut that holds it to the bracket and
t=
>hen CAREFULLY move the temp sensor and the capilary tube forward till you
c=
>an see the top of it.
>
>There is a small phillips head screw on the top, this is the adjustment
scr=
>ew. Mark that screw and the body of the sensor for where they are at as a
r=
>eference. Now turn it counter clock-wise to lower the tempurature at
which=
> it kicks out the compressor. Use 1/4 turn inrcrements and go for a drive
=
>after each one to make sure the vent temps don't go too low (causing
evapor=
>ator to freeze. Use a calibrated thermometer in your air vents to
accuratel=
>y check the tempurature.
>
>Some people on AW have reported that their sensor only needed 1/4-1/2
turn,=
> mine OTOH needed a full 2 turns, so YMMV. Anyway, this was WELL worth the
=
>time it took to do this. Oh, just wondering, what terrible things happen
if=
> the evaporator does freeze over? I didn't have any way to get a
therometer=
> probe into or behind the evaporator, so it COULD be frosting up during
the=
> compression cycle, assuming that the vent temps vary greatly from the
evap=
> temp (which IMHO is quite possible on these systems).
>
>TIA,
>
>Dave
>1987 CGT Special Build 2.3
>SE Virginia
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