Citroen Xsara 1900 diesel, heating motor failure

Hello, I need urgent help, I have a Citroen Xsara 1900 diesel, the heating fan only works when I start the car and if I have the roulette to the maximum, I can only download a little, to the minimum and in automatic nothing works, and changed the picture of the roulettes and remains the same, and searched They canceled it.

THANK YOU SO MUCH

The resistance plate are inside the fan engine itself that you will have to disassemble (under the companion dashboard) the ZX, 405 etc are the same and if it serves you as a cosuelo, they "go" quite a lot