[urq] Urq radiator fan wiring

[Mike Sylvester]

When the resistor is in series with the motor the current draw is less.
V=IR or
I= V/R

V doesn't change in this case so more R gives you less I.

Mike Sylvester



Louis_Alain_Richard at computerhorizons.com Louis_Alain_Richard at
computerhorizons.com
Fri Sep 30 11:14:54 EDT 2005

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> I've been digging through the 83 urq radiator fan wiring diagrams and
> have found an inconsistency in the factory documentation. (surprise,
> surprise...)
>
> The IST document shows that the A/C double relay as triggering the
> medium speed on the radiator fan. The M&A document shows the A/C double
> relay as triggering the high speed on the radiator fan. Does anyone know
> which one is correct?
>
> Dave


Dave,

On my car (1983, ceramic fuses), the AC relay triggers the high-speed fan.
But, being in your place, I would do it so the medium speed is triggered by
the AC, just to lower the noise level. I guess the current draw is the
same, no matter the speed, because of the resistors being added in series
with the motor.

Maybe Audi changed the wiring for North-America because of the high temps
of the Sun belt ?

HTH,

Louis-Alain