Peugoet 406v6 wiring relay location of fan relays under hood?

of couse indeed,there are the relays for both motor fans,you can shunt each to test that the fans are running,if not, then check the brushes are in contact with colector´s rotor so,some times the carbons remain bonded by dust and does not make the contact and does not works the motor fan.make the dessasembly carefully of motor wich did not work it,even though they don have screws,you can open them carefully. If are not possible to you, just buy one or both if necesary for the case of any of them did not works after the test made it as in the begining was said it.