87 5KTQW injector cooling fan problem

[Ameer Antar]

actually audi designed it so the fan can go on at any time, w/ or w/o 
engine running. Although the after-run relay connects to the same power 
supply as the inj. fan, the inj fan has it's own relay #15. The two 
circuits are only sharing the same power source, but they each have their 
own circuits. They are both getting power through fuse 21 and also thru 
wire dist.#20. After that the power is split to each circuit. Even though 
what you say makes sense, this is what audi came up w/.

It sounds as though yer having some other kind of problem though. I never 
had a problem related to the cooling fan. Maybe the sensor is being 
overheated b/c it's too close to the engine/exhaust. Maybe your having 
battery, wiring, or charging issues [check alt. belt...] It could be a bad 
motor too. Check how much current the fan is draining. I have no idea what 
it should be, but I think it should definitely be under 8A...more like 2A 
or so. If not, your batt. is dying on you b/c of something else. Check the 
current drain on the batt. w/ the ignition off, as was discussed 
recently...good luck.


At 12:43 PM 10/16/00, you wrote:
>This is really important. Can you verify for me that the injector fan runs
>all the time when the engine is hot, even when the engine is running? I
>thought that it only ran when the ignition was off. Otherwise, wouldn't this
>wear out the fan unnecessarily? Why would you want it on when the engine
>runs, since the fuel itself cools the lines. Isn't this all about vapor lock
>after the engine is shut off? Am I wrong here?
>
>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: Ameer Antar [mailto:ameer at snet.net]
>Sent: Friday, October 13, 2000 4:15 PM
>To: Paul Meyers
>Subject: Re: 87 5KTQW injector cooling fan problem
>
>
>there are 2 different fans here. Early on the rad. fan only ran w/ the car
>on, but the injector cooling fan ran all the time, as long as the
>thermoswitch says so, even w/ the car off. My car does this, but is fine w/
>the batt. drain. It also shuts off several mins. after the engine stops,
>usually. You might check to see if the inj. fan is staying on too long or
>if your charging system needs attention...batt, alt, corroded wires/joints,
>etc. good luck.
>
>
>At 04:22 PM 10/13/00, you wrote:
> >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