Peugot fan

As an addition, I have just shorted across the temperature sensor and the fans do not come on, I also tested for correct voltage at the sensor and it was ok, so the problem is somewhere between the switch and the fans... ?

I have also had the headgasket professionally leak tested and the cooling system, all are working just fine.

Andy

As a 'get you home method' why not just wire the fans to a ignition switched supply so that are on all the time the engine is running?

Normal cooling is with the fans in series and high speed connects them in parallel

Thats interesting, it means that if one of the fans gives up the ghost, they both stop working does it???

I suppose I need to check the fans but the wirings all hidden and strapped up with akward access.

I am going to check for broken wires tommorow.

Andy

If all else fails use the "on the road" emergency cooling - run the heater full blast. You will get hot but the engine will cool.

This site shows an explanation of how the dual fan system works for cooling on 406 diesels.

If, as you say, unplugging the brown connector should cause both fans to run, couldn't the original poster use this as a method of getting home from Blackpool?

Many thanks for the usefull reply, however, I am a bit new to peugeots and I can see two 'brown' plugs. One is underneath the Temperature sensor on the right hans side of the engine. The other brown connector is at the front right of the fuel filter housing?

Andy.

I have tried disconnecting all of the sensors and plugs I can find, none make the fans come on! - I have checked the 40amp fuese, I cannot remove them as they are heavily corroded, but they are not blown.

Does this have a bitrol sensor, I thought that was only the HDI ?

Andy

If the connections are heavily corroded, then they won't be working :)

I do not know the answer but, as Michael said the plug by the thermostat, I guess that means the one by the temperature sensor rather than by the fuel filter.

SNIP>>

Yes, I went out last night and disconected every single connector I could find, none of them made any difference!

I am thinking of trying an auto electricians - *Defeat*

Andy

I know the feeling, but I suppose there is wisdom even in defeat ;o) Let us know how it pans out.

It is booked into a french auto electrics specialist in Redmarsh estate, Blackpool tommorow morning.

Watch this space!!

Andy

Update..

The problem is now fixed.

I took it to what I can only describe as the worst garage in the known universe, the garage who where trying to sting me for a new ECU, so I recovered the vehicle.

I drove back to Bournemouth at 02:30 in the morning to avoid the traffic, foolishly taking the toll road thinking it would be a nice straight run only to find one pay booth open and a big queue of traffic all beeping there horns at somebody who had forgoton there money.

I got a local chap I know (auto electrician of 25yrs) to take a look and he traced the fault to the Bitron device under the front left wing. Upon further investigation the unit had beed previously levered open and messed with then gaffer taped up. He charged me the £30 callout fee, not bad really.

He said the unit wasn't doing what it should be, so I opened it up again and found a broken capaciter on the board. I replaced the capacitor for 11pence from Maplin 100uf - 50v £4.99 for a roll of self amalgamating tape to seal the unit back up. Car fans now work fine again.

Car electrician blokey tells me there are three different types of cooling systems on 406's - Early one's have a thermostatic switch that turns the fans on, later Mk1's have the Bitron device like mine, where the thermostat is just a temperature sender, not a switch. Later HDI's the cooling system control is part of the ECU, is this correct?

Thanks for all your help

Andy D