87 5KTQW injector cooling fan problem

[Paul Meyers]

Correct. I know that the sensor is working perfectly, since I had bought a
brand new one from my dealer (proper obescience to the Audi gods). Also, it
turns on and off only when the car is well heated up. Disconnecting the wire
(spade lug) from the sensor keeps the fan from ever coming on, thus we know
that the wire itself is not shorted to ground somewhere before it reaches
mr. sensor. Avi, you misunderstood. The fan is not on all the time. It's
only on when the engine is up to temperature. But my understanding is that
this circuit shouldn't be active unless the ignition is off. Am I mistaken?

What I don't understand is why the circuit would keep on working when I
remove the afterrun relay. Doesn't the the hot side come through this relay?
If not, what function does it perform in the circuit?

Paul Meyers 
Gray 87 5KCSTQ 1.8bar eurolights fuchs 145 kM, needs loom transplant 
Pearl 88 5KCSTQ 1.8bar eurolights fuchs bilsteins 125 kM 2pc-em k24 turbo 
Metallic White 87 5KTQW eurolights bilsteins 191 kM daily driver
Blue 86 5KCSTQ parts car 




-----Original Message-----
From: Nate Stuart [mailto:nathan.stuart at maine.edu]
Sent: Friday, October 13, 2000 8:50 PM
To: avim at pacbell.net; Paul Meyers
Cc: Quattro
Subject: Re: 87 5KTQW injector cooling fan problem


You meant _rear (flywheel end)_ of the engine, right Avi? The sensor is
close to/under the area near the ISV. It is a single spade style sensor. The
bracket the sensor is screwed into is attached by several of the cam cover
nuts.

Later,
-Nate


> Paul,
> The injector fan has it's own sensor in the front of the engine left side
of
> cylinder head (facing the engine), the circuit that activate the fan makes
a
> contact to ground.
> You either have a faulty sensor, or the wire from the sensor fell off and
is
> making continues contact with ground, causing the fan to be on all the
time,
> Take care,
> Avi
>
> -----Original Message-----
> From: quattro-admin at audifans.com [mailto:quattro-admin at audifans.com]On
> Behalf Of Paul Meyers
> Sent: Friday, October 13, 2000 1:22 PM
> To: 'quattro at audifans.com'
> Subject: 87 5KTQW injector cooling fan problem
>
> The injector cooling fan on my car runs anytime the thermoswitch is on.
This
> runs down my battery (what a current hog!). I removed the radiator
afterrun
> relay to see what effect this has, since I understand that it keeps the
> injector fan from running too long and ...  running down my battery. No
> effect.
>
> The Bentley shows some circuitous connection of the hot side through
through
> the radiator fan afterrun relay, but I don't know exactly how the afterrun
> relay controls things. Does it inhibit a circuit until the car isn't
running
> or merely make sure that the afterrun stops some time after the car shuts
> off?
>
> Paul Meyers
> Gray 87 5KCSTQ 1.8bar eurolights fuchs 145 kM, needs loom transplant
> Pearl 88 5KCSTQ 1.8bar eurolights fuchs bilsteins 125 kM 2pc-em k24 turbo
> Metallic White 87 5KTQW eurolights bilsteins 191 kM daily driver
> Blue 86 5KCSTQ parts car
>