Help Me Preserve My Repurtation

[L DC]

Huw, thank you for your insightful input. But now I
have a few Qs based on your reply, if I may :)

Huw Powell wrote:

> Your car, and any and all Audis since I can 
> remember, have a radiator fan relay.  The switch 
> itself only triggers the relay, the relay handles 
> the high current of the fan motor.

I'm almost certain the relay is there, right behind
the driver's side headlight.

Perhaps it failed momentarily?

> Yipes.  What are the odds that someone bypassed the
> relay on your car at some point?

I doubt it but will check now that you brought it up.

> On the QSW/4kq/cgt, the resistive drop is only used
> for the afterrun fan triggered by the sender on the
> back of the head.

By "restrictive drop" I guess you mean as produced by
said resistor, again in the case of my '87 QSW located
in the metal support/shroud for the fan.

Also, by the “back of the head,” do you mean the
sender off a little metal bracket attached to the rear
of the valve cover on the passenger side (actually
faces battery) or the thermo time switch hooked up
towards the middle on the rear of the cylinder head? 
To test or figure some things out, last week I started
engine and left it idling with the wires to the
resistor on the fan bracket disconnected and the
following happened:

When fan came on, it did so at high speed right off
the back and then it turned off. The temperature gauge
on the instrument cluster (albeit a crappy to say the
least) showed the needle where it would normally be
when high speed comes on.

Fan came on high again and off, high again and off.
The low speed never came on.

I hooked up the wires to the resistor and this time
the first fan speed that came on was the low and from
time to time, while on low speed, the to high speed
would also come on.

I'm running an 85-93 *C fan switch here in south FL 
given the hot and humid weather.

Then I turned engine off and low fan speed kicks in,
but shuts completely off upon pulling one of the two
wires on the resistor.

On a very hot day, the fan will kick in on and off for
as much as 8 minutes after engine shut-down with the
resistor hooked up as stock.

BTW, my '85 QSW is not equipped with either, the
resistor or the sender on the back of the valve cover.

Thanks again,

Louis



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