C4 heater/air con not working

[Shemi]

Dear Friends,
I have a 2007 Citroen C4 with an electrical power supply fault for the AC Blower just as described here.
I made a bridge between the two cables as indicated in the thread and it works randomly.
In the garage I was told that the BSM unit was defective and I had to replace it.
No number is specified on the faulty unit so I'm not sure which part I should order.
My VIN number is VF7**************[VIN obfuscated, can be read by forum staff]. Please help me order the correct BSM unit for me.

Thanks and best regards,
Shemi.

[dmatravers]

Yes, the two wires in your photo were connected with a fused bridge by the auto electrician and heater and air con then worked - but no delay when ignition was switched on. Can't remember the size of fuse - but should be the same as the heater fuse in the BSM, 15 amp??
When I eventually replaced the fusebox I simply removed the fuse and left the bridge in place - for the next time the fusebox fails.......

Hi Pete
When you say 'Bridge' the two wires, do you mean 'short' the two wires, ie, connect the two together?

[Datadogie]

I just paid £500 for mine to be fixed, new motor and controller. Water damage was the cause.

[Sam117]

Hi new to forum,daughters C4 VTR+HDI 91 diesel 2012 Blower does not work ,it does with direct feed from battery,new resistor still not working,can't find fuse or relay as mentioned in other posts,think different model/year,any help much appreciated,thanks

[ernixl]

Hi Sam, I'm having exactly same issue, did you find any solution yet?

[snusnu22]

Hi All,

New to this forum.
Having the same issue - no air flow. Was told by an Auto electrician to replace the blower motor, but it works when i power it directly (speed also changes when i decrease the current).
When i disconnect the plug from the motor, the plug reads about 8V. As soon as i connect it to the motor, it drops to 0V.
With the motor plugged in, everything before the blower resistor reads a voltage but 0V out of the resistor. I suspect its the resistor that may be faulty so i ordered a new one. After reading this thread i now have my doubts.

Any help would be appreciated, thanks!

[GiveMeABreak]

In most cases it is likely to be the blower motor control module that fails. As you've ordered one now, you'll soon know - but don't buy cheap versions as these have been known to not work.

[yommitte007]

I attach some photos of my fuse box. Please can you show me what wires to bridge to make my blower work?