Peugeot 406 heating and ventilation system dead

Depends on what you mean by " down" ? If you mean the heater motor is not operating , check fuses .

This might help you also ,

" hi there
I have seen this fault many times a most times it is the ignition switch,to test this remove the fuse box cover underneath the steering wheel. you will see the fuse box in front of you ,the large black wire going into the front lower corner ( nearest the steering colum )of the fuse board should be live with the ignition switched on also the 40 amp fuse next to it should also be live. if not then the ignition switch is faulty
if there is a live at the wire and the 40amp fuse the the fault is with the fan speed control unit.this can be found in the n/s foot well on the heater box right next the front of the center console side trim ,this unit will have 2 connectors next to each other both of them are green ,one has 2 wires red live and black earth the other has 4 wires it is held in by 1 8mm headed bolt.

hope this is of some help to you

madmark
peugeot tech "