A4 AC clutch

[Ed Kellock]

I have a set of a/c gauges and it definitely has pressure.  I pulled the
passenger headlight and tried jumping pins 1/2 and 3/4 to check pressure
switch issues.  Bottom line is it has 12v to the clutch and it's not
engaging.  Sounds like that is a definitive point of diagnosis.

Thanks for all the responses!

Ed
 


-----Original Message-----
From: quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com] On
Behalf Of Dave Fain
Sent: Tuesday, June 12, 2012 2:04 PM
To: quattro at audifans.com
Subject: Re: A4 AC clutch


If there is 12V to the clutch and it isn't working, it pretty much has to be
the clutch.  I suspected the freon was low on my 1.8L VW and I was able to
bypass the safety switch and hot wire the clutch to confirm it would engage.
Dave

You want to make sure that the system is pressurized or the pump doesn't
engage ? Some pumps have a built in safety switch that prevent dry
running/too low pressure even tho the wiring gives juice to the pump.

Marco Weibel

Sent from my iPhone

On 2012-06-12, at 12:46 AM, "Ed Kellock" <ed.kellock at gmail.com> wrote:

> I worked on my boss' 2000 A4 Avant (250k+ miles) AC tonight and 
> believe I isolated the problem to the ac clutch, but apparently it is 
> not available separately.
>
> When it should have been running and wasn't, there was 12 volts to the 
> trigger wire.
>
> With the engine off, I was able to rotate the ac compressor and it 
> felt smooth.
>
> I thought I could just replace the ac clutch, but that does not seem 
> to be the case.
>
> If either my diagnosis is poor or anyone knows where I can get just 
> the clutch, please chime in.
>
> The ac clutch part# according to ETKA is 8d0260811a
>
> Thanks!
>
> Ed
>
>
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