[s-cars] AC Troubleshooting Help needed

[Peter Golledge]

Jack,

The audifans KB has a link which I used with great success:

http://www.audifans.com/twiki/bin/view/Audi/HVACCodePulling 

-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com] On Behalf Of bullitt at gwi.net
Sent: Tuesday, July 18, 2006 10:18 AM
To: trgreen at comcast.net; s-car-list at audifans.com; bullitt at gwi.net
Subject: Re: [s-cars] AC Troubleshooting Help needed

Tom,

Thanks for the info.

I looked at http://www.sjmautotechnik.com/ and can only find info for the
5000's and no info on the codes or clearing them other than pulling the fuse
for the ECU, which probably does not do anything for the HVAC diagnostics.
Let me know if you have more info on that.

Diagnostics:

The electric fan comes on when the AC is turned on - ok there.

There is a definate sound of the compressor coming on when the AC is first
turned on.  It then starts to cycle.

Codes:

You are right, that is a lot of codes.  I did monitor some of the flap
position channels and they appear to be working propoerly.  The target and
actual position match pretty closely on all of the channels that had been
reported in the trouble codes.  I think there could be an intermittent
problem there?


I thought the high pressure switch was the culprit also, now I need to find
out why it is being tripped. I was thinking that a blocked oriface could be
the problem, blocked oriface results in high pressure since and no cooling?


Other:

The guy fully evacuated the system and put in 38 ounces (he looked up the
capacity in some type of manual).  

He did use a gage on the low pressure side.  He said it appeared to be in
the right range when operating.  He did not measure the high side (probably
becouse it is a somewhat of a pain to get at with the belly pan and all.