My Citroen C5 HDI 2001 air blower not working.Located the Thermister, which was not where most posts pointed me. It was on the passenger side and is a completely different unit to those on sale as 2001 parts. I don't know if the part works but there certainly is no power supplying it. The 4 wires are Grey , Blue , Green and Black. The 30A supply fuse under the bonnet is ok, but tracing the wires is not easy.

Laurence, August 2014

Thanks cdc, but I already checked all fuses and all check OK.
I have since managed to trace the wiring. All four wires go to the heater selector dial, with 2 extra Black and Red running to a Blue and Red connector, and then to A Black Red connector. After this What is now Black Red and White, fairly substantial wires go into a slot but I cannot determine where.

Laurence, August 2014

I have had problems with French motors before,check the relevant fuse and it is ok but they don`t mention a second fuse anywhere in the hand book so my advice is to remove all fuses individually to check,worth a go.

cdc, August 2014