[s-cars] Climate Control - Damn the Snowflake

[djdawson2 at aol.com]

I'd have to guess that he's mixing up his terms.  Ice can form on the evaporator as a result of a failed temperature probe... not uncommon.  The probe is supposed to stop icing by deactivating the clutch on the compressor.


-----Original Message-----
From: Fred Munro <munrof at sympatico.ca>
To: manuelsanchez at starpower.net; djdawson2 at aol.com; rit_bellis at hotmail.com; s-car-list at audifans.com
Sent: Wed, 20 Jun 2007 9:00 pm
Subject: RE: [s-cars] Climate Control - Damn the Snowflake



Hmm, ice on the condenser is bad, Manny. The condenser is supposed to be
ot. The compressor takes cooled refrigerant gas from the condenser and
ompresses it to liquid under pressure. The high pressure liquid passes
hrough an orifice at the evaporator and turns back to gas in the low
ressure zone in the evaporator, absorbing heat as it changes state from
iquid to gas. The hot low pressure gas then goes to the condenser where it
eleases heat to the airflow and goes back to the compressor.
If you are getting ice on the condenser, that would tell me you have a
estriction in the condenser that is acting as an orifice and allowing the
efrigerant to pass from a high to low pressure zone in the condenser,
bsorbing enough heat to freeze moisture. A low refrigerant charge can
reeze up the evaporator because the pressure drop across the orifice is too
igh and too much heat is absorbed ( the low pressure side pressure is too
ow). A high refrigerant charge usually means the low side pressure is too
igh and the cooling effect is impaired (the pressure drop across the
rifice is not high enough). I suppose a too high charge could result in
igh pressure gas entering the condenser and may make it prone to freezing
f there is a restriction there. I'm just speculating here, never had this
roblem.
Fred
-----Original Message-----
rom: s-car-list-bounces at audifans.com
mailto:s-car-list-bounces at audifans.com]On Behalf Of
anuelsanchez at starpower.net
ent: June 20, 2007 9:21 PM
o: djdawson2 at aol.com; rit_bellis at hotmail.com; s-car-list at audifans.com
ubject: Re: [s-cars] Climate Control - Damn the Snowflake

hat if I were to tell you that I noticed once after a loooong summer
ighway run in moderate temps (mid 80's), say about 5 hours of constant
unning, I found Ice on the condensor?
-manny
---- Original message ----
Date: Wed, 20 Jun 2007 17:27:11 -0400
From: djdawson2 at aol.com
Subject: Re: [s-cars] Climate Control - Damn the Snowflake
To: rit_bellis at hotmail.com, manuelsanchez at starpower.net,
-car-list at audifans.com

   Again... higher temps equal higher pressures.  If
   your A/C is cutting out only at higher outside
   temps, my bet is that you're not pushing enough air
   accross the condensor.  This could be for several
   reasons... fan clutch... electric fan... or a
   condensor plugged with debris.

   -----Original Message-----
   From: Rit Bellis <rit_bellis at hotmail.com>
   To: djdawson2 at aol.com; manuelsanchez at starpower.net;
   s-car-list at audifans.com
   Sent: Wed, 20 Jun 2007 2:19 pm
   Subject: RE: [s-cars] Climate Control - Damn the
   Snowflake

 I too am interested in the answer to the snowflake question.  My 93 s4
uit
 cooling when it hit 84 degrees or higher all last summer. Then, the car
 self-healed over the winter.  (only change being a missing belly pan.)
his
 summer (audi gods and thor permitting) the snowfake has kept right on
 working as the temps hit 95 degrees and higher.  I have long suspected the
 uper limit temp sensor, but is there another possible culprit?  Thanks!

 -----Original Message-----
 From: s-car-list-bounces at audifans.com
 [mailto:s-car-list-bounces at audifans.com] On Behalf Of djdawson2 at aol.com
 Sent: Wednesday, June 20, 2007 12:59 PM
 To: manuelsanchez at starpower.net; s-car-list at audifans.com
 Subject: Re: [s-cars] Climate Control - Damn the Snowflake


 High pressure, low pressure, and freezing are three I know off the top of
y
 head.  If the A/C works fine under less than extreme conditions, I would
 wonder if high pressure is the problem.  I would then look into the fan
 clutch and electric fan operation... these are what keep high pressures
rom
 developing.


 -----Original Message-----
 From: manuelsanchez at starpower.net
 To: s-car-list at audifans.com
 Sent: Wed, 20 Jun 2007 12:47 pm
 Subject: [s-cars] Climate Control - Damn the Snowflake



 Fellow S-heads,
 All this climate control talk has prompted me to ask the following: What
 causes the Snowflake to turn off by itself: 1. Low Refrigerant (some fail
 safe mode to spare the compressor some unsightly
 eath)
 2. Failing Climate Control Head
 3. Other
 She tho must be obeyed is annoyed with me, as my car seems to suffer from
 the
 nowflake and compressor shutting off when it's Africa hot outside. I, and
 wifey, thank you. -Manny 5.5 UrS6 Avant (Flakey Snowflake)
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