[urq] UrQ After run Radiator Fan

[Louis-Alain Richard]

If need be, the injector cooling switch for the 5000TQ (034 919 369B, 85C)
has a lower temp rating than the urq switch (035 959 481B, 100 C).

And if I am right, my car has the 100C switch (new part but fan doesn't
start often) but Brady's car has the 85C switch and it works each time he
shut off his engine.

For what this "empirical analysis" is worth...

Louis-Alain
83 urQ

-----Message d'origine-----
De la part de Justin


Yep, your right....the wiring diagram looked like it did at first..but you
would still need an "after-run" thermo switch.  Tripping a relay off a
injector cooling fan thermo switch would not sevrve as a usful
function....the thermo switch for the injector fan is rated at much higher
temp than would be nessary for an radiator type cooling switch.
If you have access to a wiring diagram, for any 5000 turbo or later 4000
quattro...they all have seperate thermoswitches dedicated for after
functions....probably for a reason...,
Justin
----- Original Message -----
From: "Andrew Finney" <afinney1 at yahoo.com>
To: <cbrooks22 at cox.net>
Cc: <urq at audifans.com>
Sent: Wednesday, April 28, 2004 3:49 PM
Subject: Re: [urq] UrQ After run Radiator Fan


> Justin, the reason the radiator thermoswitches have 3
> pins is that Audi relocated the overheat high temp
> switch down from the line between the bottom of the
> coolant recovery tank to the radiator(where it is on
> my '83 UrQ) to the bottom of the radiator in one
> thermoswitch(where it is on my '84). That third pin
> has nothing to do with afterrun. I believe the
> afterrun get's its signal from a sensor mounted like
> our injector cooling fan thermoswitch on the cam
> cover. The reason I asked the group is that I wondered
> if someone had done an easy swap of a relay or two
> with a jumper wire or some such thing from the
> injector cooling fan thermoswitch. Thanks.
>
> Andrew Finney
> 1983 and 1984 UrQs.