How can I fix blower fan on my 2002 citroen C5?

Hello
I think my problem is quite common - 2002 citroen c5 -blower fan isn't working. When I switch the ignition on the fan display lights up for a few seconds but then switches off indicating that no blades are working - some heat does still come through the vents so I'm assuming its just the fan motor thats broken. What part am Ilooking for is it the module resistor (http://www.ebay.co.uk/itm/221116824347?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649) or do I need to replace the whole unit? Lastly, where is this part located? i've read its either next to the pedals behind the trim or behind the glovebox near the rest of the fuses? is it easy to replace?

thanks a lot
Rick

rickbas
September 2012