[s-cars] Coolant fan trying to killl the battery :)

[Bjørn Ødegård]

We've been through this some times now, but I'll sum it up.
Yup, the relay 1 is the fan relay for 1st speed. (look it up at SJM's.)
But, better to fix it!
The fault is 99% in the after-run timer relay, a tall brown located
behind the passenger's kick panel. You 'll know it when you see it. The
relay is supposed to stop the fan after 8 minutes, if memory serves me
well. The fault triggers the output occationally. Mine started 'only
because it could' sometimes..
Try to yank this relay when the fan runs, and if it stops, that's it.
Replace or fix. (Often a small 2n2222-type transisitor alongside the
board,  for those of you that own a soldering iron.)

HTH,
Bjorn  :o)
'92 S4 MTM with happersized output transistor on the after-run relay.

----- Original Message -----
From: "Sandy Sligh" <sdslig at yahoo.com>
To: <s-car-list at audifans.com>
Sent: Thursday, October 30, 2003 5:02 AM
Subject: [s-cars] Coolant fan trying to killl the battery :)


> This has happened very rarely, like maybe once in a 3
> or 4 months: The coolant fan runs once the engine is
> shut off and will continue to run until the battery is
> drained far enough that the fan won't spin nor will
> the starter crank.
>
> So I crack open my Bentley vol. 3 and scour the
> electrical diagrams for a possible answer. Now, I have
> a 1993 S4 Canadian which is actually a 1992 model.
>
> Diagram X100 (92-93 S4) show that if I were to pull
> the relays sitting in positions 2 and 3, I should be
> able to open the circuit that powers the motor. While
> in a discharged state, I hook up the S4 to a jumpbox,
> lo and behold, the coolant fan spins up. I reach in
> the relay panel and yank out the two relays sitting in
> positions 2 and 3. The fan keeps running...grr.
>
> (But wait, I notice there is a relay in position 1.
> Why is there a relay in position 1? According to
> diagram X31, the layout of the relay panel, "1" should
> be open for the 92-93 models...)
>
> I pull out the mystery relay and the fan stops. YAY. I
> no longer have to jump start the S4 in the morning and
> afternoon anymore. But what did I disconnect?
>
> Now, there is a relay in position 1 in the 1994
> S4...well, there appears to be two groups of 1994 S4
> diagrams.. i'm confused.
>
> Anyone have any input? Are the diagrams for the 92-93
> S4 incomplete?
>
>
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