87 5KTQW injector cooling fan problem

[Paul Meyers]

Thus, the system is working "as designed". It's no wonder that the injector
cooling fans wear out. What could they have been thinking? Ok. I'd better
stock up on the fans. I'll likely deal with the electrical problems by
increasing the alternator output voltage to 14.4 amps by using an Avi
alternator. That should provide enough "headroom" to charge the battery even
if I have some voltage loss between alternator and battery. I have already
replace the swaged connector between alternator and battery. Thanks.

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: Monday, October 16, 2000 11:59 AM
To: quattro at audifans.com
Subject: RE: 87 5KTQW injector cooling fan problem


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