[s-cars] Engine Management shuts off AC?

[TMULLANE at snet.net]

Sounds like a bad MFTS (multifunction temp sensor).  
One of its jobs is to prohibit the AC from coming on 
if engine temps are too high.  The sensor is located 
in the water manifold just above the thermostat.

Tom

Date: Tue, 26 Jul 2005 07:57:11 -0500
From: "Toborg Michael (AC-SM/ESC3) *" 
<Michael.Toborg at us.bosch.com>
Subject: [s-cars] Engine Management shuts off AC?
To: <s-car-list at audifans.com>
Message-ID:
<18CC350E919CE04A831B9CCE2B88700643552C at sbdmail09.us.b
osch.com>
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Still sweating in my 95 S6...
Used diagnostic channel #52 yesterday to try and 
figure out why the AC
doesn't work, and I got segment d3 to light up. 
Bentley says this is
"Engine management system" It pretty much turns off 
the compressor as
soon as it comes on. When driving I can feel a slight 
hesitation when
the compressor cycles... The electric fan seems to be 
working fine.

So what does this code mean? What part of engine 
management system is
shutting off the AC?
I gues a VAG tester might be the next tool to use... 

Thanks!