83 5kt fan resistor

[Tex Terry, II]

Huw  -  Thanks for the info below.  I will check and see what I can find
and let you know how I fare.  All (of everyones) help is greatly
appreciated.  Tex.
----------
> From: Huw Powell <audi at mediaone.net>
> To: texactii at csonline.net
> Cc: quattro at audifans.com
> Subject: Re: 83 5kt fan resistor
> Date: Friday, June 22, 2001 4:16 PM
> 
> 
> 
> "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/