[200q20v] Re: [s-cars] Old thermostat information reposted

Nick Marvin marvin at icon.co.za
Fri Mar 2 07:26:10 EST 2001

Thank you for re-posting this info. IDGAB (It doesn't get any better!, the
info that is.)

95 S2

--- Original Message -----
From: <qshipq at aol.com>
To: <urq at audifans.com>; <s-car-list at yahoogroups.com>; <200q20v at audifans.com>
Sent: Thursday, March 01, 2001 5:29 PM
Subject: [s-cars] Old thermostat information reposted

> Here's some information wrt water thermostats.  All -oil- thermostats for
> *all* I5's are the same since 1982@ 100c (and the same part number for all
> those years too).  FYI, I believe I have somewhere (if I find it, I'll
> a TSB that indicates that if customer complaints arise from overheat (hot
> climates) change to the 80c thermo (urq TSB).  Otherwise, the application
> 87C for all I5 engines.  This is a common thermostat available from a
> of sources (shares the application in Alfa Romeo's if I remember
> If you have an urq, you are probably better off with the 80c since this
> runs hot most of the time anyhow (a must do if you deleted the aux rad).
> a rule, I install the 87C thermo on all cars other than my urq's, since
> can get oil blowby on the cylinder walls when it gets really cold with the
> 80c thermo (btdt).  I've also messed with the fan thermostat on my cars
> are the later I5 apps, the 2 pin the earlier), but didn't find a whole lot
> difference running a cooler fan switch, YMMV.  The 7blade fan from the
> turbo cars is a great upgrade, and makes a bigger difference than any
> thermostat IME.  FYI, the 7blade fan is a bolt in mod for the 44 chassis
> cars, but the urq's will *not* bolt in without some trimming or changing
> shroud.
> A tech at audi AG told me quite a few years ago, that what you really want
> watch is the head temps.  You should be in the 205-215F head temps in the
> hottest conditions, this is where the I5 operates "best" in terms of
> efficiency.  The english translation was basically, go to 100c and turn
> on to keep it there "at all prices" <costs> (meaning big oil cooler, rad
> on high, etc)
> SJ
> Subj:   Thermo part #'s
> Date:   95-08-13 12:00:03 EDT
> From:   PDQSHIP
> To: rdh at sli.com
> CC: quattro at coimbra.ans.net
> I know Dave Lawson posted em..... and Glen Powell has too....  Yo
> Oops found em.....  Ok per Dave L (4-20-95) here you go:
> 035-121-113        80C thermostat
> 035-121-113B      87C thermostat
> The Fan switch choices are as follows:
> AUDI PN             APP
> 321-959-481E     2-pin  95-84C
> 823-959-481D     2-pin  82-77C
> 823-959-481E     2 pin  70-75C
> 823-959-481F     2-pin  92-87C
> 811-959-481       2-pin  95-90C  (86-87 coupe)
> 321-959-481       3-pin  93-88C/85-80C
> 321-959-481D    3-pin  102-91C/95-84C
> BTW, I found a oil thermo in my pieces parts bin that is a 83C thermo, but
> don;t know the app, anyone help on this?  It is an easy swap, but this one
> was off my Rally car.....
> Scott Justusson
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