Re: '91 100 After Run Fan

[Steve Buchholz]

By jumpering the temp switch you have verified that the afterrun system is working.  You have a temp switch that is more conservative than the one Audi chose to use.  You have a non-turbo engine, which should have less need to keep things cool after shut down than a turbo motor.

My recommendation would be to hook the switch back up and call it good.  Perhaps some day when you shut down during  a tour of Death Valley in the summertime you can make proper use of the afterrun system.

Steven Buchholz (mobile)

----- Reply message -----
From: wadd-wadd at usa.net
Date: Sun, Aug 29, 2010 6:47 pm
Subject: '91 100 After Run Fan
To: "Tony Lum" <tlum at flash.net>
Cc: <quattro at audifans.com>


I have the 85 degree after run fan switch too.

Here is what I did: I simply connected the two wires together. This way the
fan comes on every time after I shut off the car and turns off once the timer
in the relay kicks in.

Any adverse effects of this modification? Alternatively, is there a lower
temperature after run switch available?



------ Original Message ------
Received: Sun, 29 Aug 2010 11:53:57 AM EDT
From: Tony Lum <tlum at flash.net>
To: wadd-wadd at usa.net
Subject: Re: '91 100 After Run Fan

> Take a look a the switch.  If its not 85 deg C marked on it, get one.  In
reality, I've got two cars with the same system and neither one has ever
really run.  Part of it I think is because of where the switch mounts. 
Stuck up in the air on the left side of the valve cover (drivers).  The older
cars mounted the switch on a bracket over the right side of the engine right
over the exhaust manifold.  Even there, with the low temperature switch, I've
heard run only a couple of times.
>
> Tony
> '83 urquattro
> '87.5 coupe GT
> '89 100 Avant
> '01 A4 Avant quattro 2.8
>
>
> --- On Sat, 8/28/10, wadd-wadd at usa.net <wadd-wadd at usa.net> wrote:
>
> From: wadd-wadd at usa.net <wadd-wadd at usa.net>
> Subject: '91 100 After Run Fan
> To: quattro at audifans.com
> Date: Saturday, August 28, 2010, 10:27 PM
>
> I've never heard the fan come on after I shut off the car. When I jump the
> terminals of the sensor at the back of the engine block, the fan turns on.
> I've replaced the sensor, but the fan still does not turn on after a hard
> run.
>
> Any suggestions on verifying the after run fan system is operating
correctly?
>
>
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