[s-cars] A/C still sorting

[calvinlc at earthlink.net]

I would think speed sensor.  But is this the same engine speed sensor as
feeds the rest of the electronics?  If so, then I would think other problems
might show up as well.
--Calvin


-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com]On Behalf Of james McCarthy
Sent: Sunday, November 04, 2007 8:07 PM
To: s-car-list at audifans.com
Subject: [s-cars] A/C still sorting


All,
Thanks for the previos messages.  Here's where I am:

Once again I'm getting this code:
01270 A/C clutch - N25 speed deviation too great

Here's what I've done:

1) Inspect the wiring for the compressor - clutch and
speed sensor - no obvious problem.
2) With the car off, loosen the serp belt,  the
compressor wheel spins freely - then run 12 volts to
the compressor - I can here the clutch activate - I
can still turn the compressor - though it feels
different (like  I'm actually  rotating the compressor
not just  the  wheel)  I then repeated this on my
avant - same result - this leads me to believe that
the compressor is OK - is this sound logic?
3) Inspect serp belt - seems fine and tight
4) Comparrison of the tensioner to the tensioner on my
avant - the avant seems slightly stiffer - could
something  this subtle be the culpret? Tesionseems
fine.
5) Inspect the crankshaft vibration dampre - seems OK
- but I'm not sure how it would look if it was
failing.

Next thought is the speed sensor - however if this is
the problem shouldn't I have gotten the "open/short to
B+/SP as the Bently seems to indicate?

So I'm wondering  - relpace the speed sensor or the
tensoner or the compressor?
None are free of course...

Thoughts?
thanks
jamie

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