[Biturbos4] After-run thermoswitch modification

Brandon Rogers brogers at terrix.com
Mon Nov 19 08:31:28 PST 2007

If nothing else - I like the idea that the fan blows the air around.
Granted it will be blowing hot air in at first (air coming across the
hot rad), but after a couple minutes the water in the rad should be
cooler - and hence in coming air cooler too.....


-----Original Message-----
From: biturbos4-bounces at diablo.audifans.com
[mailto:biturbos4-bounces at diablo.audifans.com] On Behalf Of Single Malt
Sent: Friday, November 16, 2007 6:22 PM
To: biturbos4 at audifans.com
Subject: Re: [Biturbos4] After-run thermoswitch modification

I did this mod too, many years ago.  The wisdom seems straightforward
but I've had a number of people bring up the after-run pump failure
potential as a negative.  I like to think that the exercise it gets from
the new temp switch is better than it sitting idle ....

For what its worth, my after-run pump has held up well.  It kicks on
after every drive.  I like the feeling that there is *some* cooling
circulation going on after the car is shut off.  I've read other
feedback on this that the coolant does not circulate through the turbos,
so what good is it ... I guess there is a programming mod that will pump
the oil after shutdown???  Some have said this is a better concept for
turbo cool down post shitdown.  I, of course, no little to nothing about
the engineering aspect of it all - but surely the coolant circulation
helps bleed ambient heat from the engine and compartment thus lending a
overall cooldown at an accelerated rate from not performing the mod.

My battery did fail last year, but this was after a loooong period of no
use - throuigh the winter.  The car was buried in many feet of snow -
one day I heard the alarm going off - it was kind of eerie, weakly
honking in the depths of all that snow.  Apparently the weak battery was
causing a number of anomolous reactions - my cluster was displaying pure
nonsense and the car wouldn't even pretend to turn over when I tried the
ignition.  I did not lose my radio code though - so I guess there was a
bit 'o charge left in her.

2001.5 Laser Red S4 parked at 9200 feet outside Denver, CO other Audis
in the corral: 1987 4000 CS Quattro, 2001 A8L Quattro

----- Original Message ----
From: Ti Kan <ti at amb.org>
To: biturbos4 at audifans.com
Sent: Friday, November 16, 2007 12:19:31 AM
Subject: [Biturbos4] After-run thermoswitch modification

Hi all,

I replaced my S4's after-run system thermoswitch today with a lower temp
unit as described in this Audiworld article:

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