[s-cars] Afterrun relay? Thermoswitch..Rust in a trim?

[Tom Green]

Ivan,
I hope you have been out saluting the Stars and Stripes as well as  
going nuts over the
afterrun system.  :-)

Check pages X1105 for the afterrun circuit as Fuses, Engine cooling  
system.  And X1098
for the Aux Relay Panels 1 and 3.  It shows a fan relay in Aux panel  
1 (J69) which is
part 8D0 951 253 A, I believe.  And the J155 Turbo coolant pump  
control module is part #
447 965 571 A in Aux relay panel 3 in passenger side kick panel.  I  
know, these pages are
listed for the '96 Canadian S6, but I can't find any others.  The  
afterrun relay is in the passenger
kick panel slot #5 and should have a part # to help identify.  That  
is most likely the faulty part
but I don't know why the fan isn't running also.  This is a battery  
killer if this relay doesn't open
after the 5 or 10 minute run time since the fan and pump will  
continue to run until power is exhausted.
This circuit operates approx 5 minutes after shut down if the thermal  
switch (F98) under the coolant pipe
  reaches 106-112C.  Check this one by shorting the connector to make  
pump and fan run.  That 112C
is difficult to reach as you indicate, but it shouldn't be the  
coolant boiling point.

This Afterrun relay was also used in the 5000tq so it is a common part.

The coolant fan control operates stage 1 on at 92-97C and off at  
84-91C and stage 2 on at 99-105C
and off at 91-98C.  Perhaps there is some added resistance in the  
circuit from corrosion on connectors,
etc. Make sure the fan turns freely and is not requiring excessive  
current to start.  It should operate well
below the coolant boiling point with the engine running.  I believe  
you replaced this switch at the bottom
of the radiator?

I have assumed that this testing has been taking place without  
airconditioning since a/c operation will
cause the fan to run also.

The trim clips start to rust under the trim after a while.  I don't  
think there is a cure except replacement.

I didn't see any follow-up on your engine speed sensor failure.  Was  
it a sensor failure ?

I would look at engine mounts and the bolts fastening the  
transmission flange to the engine for the
source of your "kick".  Sounds like something is moving--apparently  
your thoughts since you looked
at transmission mounts and driveline.

Tom '95 S6


> Date: Mon, 04 Jul 2005 10:16:54 -0500
> From: "Ivan Demkovitch" <idemkovitch at hotmail.com>
> Subject: [s-cars] Afterrun relay? Thermoswitch.. Rust in a trim?
> To: s-car-list at audifans.com
> Message-ID: <BAY104-F16D7F9AE65A515D8933897AEE70 at phx.gbl>
> Content-Type: text/plain; format=flowed
>
> List,
>
> Have 3 small issues for now :)
>
> 1. I just noticed yesterday that Afterrun pump stayed on forever.  
> It stayed
> on without fan, but fan operates properly (i.e. afterrun system  
> works fine,
> but this time pump never turned off). This make me think that also  
> they
> should operate together - they turned on by separate relays and the  
> one that
> connects pump sticking. Where is that relay located and where is  
> electric
> schema in Bentley?
> It's 93' S4 and I have 3 book Bentley. Found main cooling circuit,  
> but can't
> find afterrun.
>
> 2. May be not an issue at all.. I had coolant starting to boil over  
> before
> fan kick in (had to keep it at 4k RPM for minutes to test operation  
> (it
> wouldn't overheat on a road). I replaced thermoswitch and this time  
> fan
> started little sooner but still too late in my opinion. When in my  
> usual
> driving temp stays at this thick bar or little lower on highway little
> higher in traffics - this time it got up to almost next thinner bar  
> before
> fan turned on. But fan is 2 speed.. When second speed will be  
> turned on?
> Do I have correctly operating cooling system?
>
> 3. Moldings get rusty on the ends and start to pop off. Upper left  
> rear door
> just snapped off yesterday. How do you fix them? What part # for  
> clips?
>
> TIA
> Ivan