[A4] After-run pump, 30V

Scott Simmons indischrot at gmail.com
Thu Jul 17 10:37:53 PDT 2008


    Thanks for the reply.  I know my 944's would kick on the radiator 
fans any time the sensor detected a certain temperature.

    My A4's fan runs on "high speed" (hair dryer sound) almost all the 
time because I have the A/C on.  I bet this keeps water temp lower than 
it would be if I was on a death wish with "Econ."

    I will investigate the wiring diagrams and see what temp sensor it 
uses to kick on.

Scott S.

Tom Christiansen wrote:

> Scott,
> Don't know if this is applicable, but the late 80'ies Audi 5000 
> Quattro I had a while ago had the after-run feature. As did many other 
> vehicles of that vintage. I think it only ran if the fans had been on 
> the highest speed. If that translates to your car, you should see the 
> fans come on once you hit the 2nd fat mark at 1 o'clock on the 
> thermometer.
> If you have a Bentley manual, you should be able to figure out how the 
> system is supposed to work from the wiring diagrams. There might even 
> be a test procedure for testing the after-run.
> Tom
> On Wed, Jul 16, 2008 at 10:48 PM, Scott Simmons <indischrot at gmail.com 
> <mailto:indischrot at gmail.com>> wrote:
>     Hey all,
>        Verified that my car (2000 ATQ) does indeed have an after-run pump
>     (and module by the vacuum reservoir).  I have the 8Z6 option for "hot
>     country," which appears to include a heavy-duty radiator, after-run
>     pump, and heavier cooling A/C.
>        Bentley seems to indicate that the pump, after MY 99, will run
>     for 3
>     minutes if the vehicle is driven.  I'm not sure if I've ever heard
>     this
>     thing run.  I got the car good and hot (oil temp at "11 o'clock") and
>     shut it off.  No sounds from under the hood.  Does it have to reach a
>     certain temperature and THEN it will run for 3 minutes?  The coolant
>     temp always sits at "noon" (within a hair of it one way or the other
>     sometimes).  Heat soak temperature readings, that is: me returning to
>     the car after it has sat for awhile, finds the needle barely past noon
>     (almost to the next mark).
>     Anyone have experience with an after-run pump?  Any specs on what
>     all is
>     included with the 8Z6 option?
>     Thanks,
>     Scott S.
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