Peugeot faults 407HDI 1.6 fan does not cut in when hot, but can turn by hand, fueses ok where is the sender unit for fan to cut in, cant find on engin? can you help please?

Have oil pressure checked possible bad oil pump

REPLACE THE FAN CLUTCH AND BLADES, BE FINE, ALSO CHANGE THE THERMOSTAT

Google "where is fan thermostat" on your make and model. This is a likely cause, however the fans do go bad as well. You can disconnect the fan wiring and run a jumper to the battery to test the fan.

the FSM covers this , under how to test the engine cooling fan.
each car and ENGINE option is different. what engine do you have.
on newer cars the PCM controls the trip points.
it used the engine ECT to see the actual temp and software (firmware)
then enable the fan relay.
you said overheated but what did the scan tool shows for ECT
???????? only that matters, as it is FIRST in the CHAIN.
other engines or older cars have box that does all this.
i cant look yours up because alldata.com is USA spec.cars.

year and model will help

depollution system means emmision control unit which means lambda sensor + computer and catalytic convertor...
have the lambda sensor/oxygen sensor replaced.

Remove the fan sender unit wire which should be around the cylinder head the best way to locate it is to go by the wiring frm the fan to the sender unit.
Ones found , switch 'on' the igntion and then pull the wire from the sender unit , the fan should come 'on' there. if not thn the fan could have gone, probabely it could be the brushes inside, the best way to do is to replace the complete fan assy.

You can also check the fan by disconnecting the wires from around where its fitted there must be a connector, remove the connection and get two wires and connect it to the fan wiring and the others to the live and negative if the battery, the fan , if it' s ok should roar here, if the fans ok then the sender unit maybe faulty, you will have to replace it.
Good Luck.


Knight.

I have 1996 Peugeot 406 (1.8 16v) and it's ignition coil pack was broken and the starting was difficult when the car was warm.  

Does it go off after the car is started? If not, replace the oil sending unit, if it still doesn't go off, have the oil pump checked, the pressure release valve might be stuck.

Read the owner's manual! The fuses are all listed in there..
Its just as possible that its an ecu fault or multiplug connector at fault, or the blower motor. Im afraid 307s of this era are notorious for electrical faults...