83 5kt fan resistor

[Huw Powell]

"Tex Terry, II" wrote:
> 
> Huw  -  I will try to locate this.  Do you know what wattage it is, in case
> my only source is to go to a local electronics store for a suitable
> replacement?

as a wild guess I'd say about 200 watts.  might be only 50 or 100, and
there would be ways* to calculate it I suppose, but I think 200w will do
it.

*measure resistance of fan winding = Rf.
R = resistor, probably 0.9 ohms.
Vf = voltage across fan winding
Vr = voltage across resistor
Pr = power dissipated in resistor

Vr + Vf = 13 volts.  Vr = (R/(R+Rf)) * 13

Pr = ((Vr)^2)/R

this is the actual power dissipation in action, obviously the resistor
should be rated quite a bit higher.

others - feel free to check my rusty electrical formulae and correct as
necessary.  Has Ohms law changed much in 20 years?

> > > Huw - The resistor I am asking about is mounted on the body of the
> engine
> > > compartment, just underneath the radiator plastic fill reservoir.
> >
> > according to the family album, the part number for the radiator series
> > resistance is 433 959 493 A, and might be 0.9 ohms.
> >
> > the bracket that holds it is NLA.

-- 
Huw Powell

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/