I have a 2005 C4 Exclusive with climate control A/C on which the heater fan does not work. The fan itself tests ok on the bench. I have replaced the 'resistor' with no effect. There is voltage at the fan and resistor. I am thinking that maybe there is a relay on the under-bonnet fuse box (BSM) that is faulty. I have had no success in getting a wiring diagram yet. If I could buy a new unit for a reasonable price it would be worth a try- does anyone know if there are suppliers outside the expensive Citroen dealer network?[FONT=Calibri, sans-serif]MyBSM has the following label: 9657718780 BSM-L06-00 S118983006L.[/FONT]