[s-cars] 93 S4 Aux h20 pump

[Tom Green]

Original message:
> Date: Fri, 13 Oct 2006 21:31:59 EDT
> From: Realcoast at aol.com
> Subject: [s-cars] 93 S4 Aux h20 pump
> To: s-car-list at audifans.com
> Message-ID: <bd7.6725f68.3261980f at aol.com>
> Content-Type: text/plain; charset="US-ASCII"
>
> I have replaced the little inline water pump that fills the heater   
> core,
> I have heat, on and off, connections are good.
> anyone got an idea ????
> thanks
> Dave
> 93 URs4

> Dave Forgie replies:
> Date: Sat, 14 Oct 2006 00:06:29 -0600
> From: "Dave Forgie" <forgied at ae.ca>
> Subject: [s-cars]  93 S4 Aux h20 pump
> To: <s-car-list at audifans.com>
> Message-ID: <s5302a21.074 at mail.ae.ca>
> Content-Type: text/plain; charset=US-ASCII
>
> : DaveYou need to find out what the climate control head computer can
> tell you.  Go to:
>
> http://www.audiworld.com/tech/int6.shtml
>
> The answer should be somewhere in there. Could be a sticky flap  
> valve on the air distribution.
>
> Dave F.

Do what Dave F. suggests.  Read the error codes in channel one  
(01c).  If you copy the pages in
this link, they will give you a better explanation of the trouble  
codes and suggested remedy.  The
best action to take for intermittent faults is to clear codes and  
check after operating the system in
all modes to see if they return and thus need some correction.

  http://www.12v.org/maintenance/index.php? 
section=tr&ss=hvac&ch=ccodes&v=1

Do you still have that little inline water pump?  Unless it was  
leaking, I would give good odds that
it is a good pump.  It runs so little that they hardly ever wear  
out.  As far as I know, it only operates in
conjunction with the afterrun relay circuit to circulate water  
through the system to dissipate residual
heat from the turbo above 105ºC water temp.

Tom