20V After-Run System Consensus

Bernie Benz b.benz at charter.net
Sun Jul 27 08:14:31 EDT 2003

Comment below.

> From: BriceW at webtv.net
> Date: Sun, 27 Jul 2003 04:11:44 -0500 (CDT)
> To: 200q20v at audifans.com
> Subject: 20V After-Run System Consensus
> I have about got the WHOLE cooling system changed over to new.
> What I have NOT changed yet is the radiator fan motor, blower motor and
> the heater core.
> Everything else is brand spanking OEM new. New 1st,2nd and 3rd stage
> relays.
> New after-run switch, new MFTS with new connectors and wiring, new blue
> 3 stage resistor pack, new after-run aux. cooling pump relay, new
> radiator and aux. radiator, all new hoses and connector clamps, new
> water pump and all of the of the mandatory things associated with that
> job, new coolant tank reservoir, new mounts,etc.
> My after-run system is not operating properly. At least not as I
> remember former Audis operating.
> The after-run fan and pump seem to never turn on. It turned on yesterday
> for the very first time in a long time after a 20 minute drive on a very
> hot day with the air conditioning on which turns on the high speed fan
> and cools the system.  I am used to the Audi after-run system turning on
> after a short drive in normal temperature without air-conditioning, This
> is my 5th Audi.
> My question is.
> What is the normal after-run time for our cars?
> I almost want to try the lower temp after-run switch as I don’t feel
> that my after-run system is operating properly.
> I know that Scott does not recommend this switch as it lowers gas
> mileage.
I believe that Scott was talking of the two stage rad fan switch.  How could
the after run system effect gas milage, when the engine is off?
> I live in Kansas and shouldn’t need this lower temp switch.
> What is the NORMAL for the after-run fan and pump to turn on? NORMAL in
> Summer and in Winter.
Normal is determined by the set point of the after run relay and the coolent
temp at that sensor.  With all that new crap you may have changed the
coolent temp as well as the sensor set point.
> Maybe I am be to exacting about the after-run system but I feel that it
> is very foundational to the whole car.
Maybe!!!  Keep working on that wallet, it'll come down.


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