Returned mail

[MAILER-DAEMON@ncrgw1.attgis.com]

Your mail could not be delivered because of the following reason:


   ----- Transcript of session follows -----
Executing: /usr/bin/uux - -gI  ncrhub4!rmail (columbiasc.attgis.com!david.moxley)
uux failed ( -1 )
server "/usr/bin/uux" failed - unknown mailer error 1

   ----- Unsent message follows -----
>From quattro Tue Jan 31 14:17:33 +0500 1995 remote from swiss.ans.net
Received: by swiss.ans.net id AA12114
  (5.67b/IDA-1.4.4 for quattro-outgoing); Tue, 31 Jan 1995 14:17:39 -0500
Date: Tue, 31 Jan 1995 14:17:33 +0500
From: quattro.corp.inmet.com!walter (Walter Meares) 
Message-Id: <9501311917.AA06920@quattro.corp.inmet.com>
To: swiss.ans.net!quattro 
Subject: re: Re: TQC heater core replacement (Now A/C info)
X-Sun-Charset: US-ASCII
Content-Length: 1151
Sender: quattro-owner@swiss.ans.net
Reply-To: quattro@swiss.ans.net


> The 4000 cars probably use an A/C system that runs the compressor all the 
> time and then regulate the evaporator pressure to control the amount of 
> cooling.

The 4000 uses a cycling clutch, operated by a thermostat that senses 
evaporator temperature.  Very traditional, low-cost AC implementation.

> 
> The 5000 cars use a Cycling Clutch Orifice Tube (CCOT) system (from 
> General  Motors ie Cadillac) that turns the compressor on and off to 
> regulate the evaporator temp. There is an orifice tube (no evaporator 
> valve) that is used to somewhat regulate the flow of liquid freon into the 
> evaporator where it expands and absorbs heat from the interior of the 
> vehicle.

I'm not familiar with this animal.  GM's older system uses both an expansion 
valve on the evaporator inlet and a POA (pilot-operated-absolute) valve on the 
evaporator outlet to control evaporator pressure to the desired level.  The 
compressor runs all the time the AC is on in this type of system.  The system 
had excellent performance without the annoying loading/unloading of the engine,
and was used by Rolls-Royce, Mercedes, Lincoln, and others.

Walter