406, 2.0ltr a/c cooling fan help.

"rockabilly" wrote: > hi all. newbie here and require some help. my 406 2.0ltr > petrol has developed a problem. there is two fans on the front > of the air con rad. the drivers side is the only one working. > wether i use the air con or not?. also the temp goes right up > to 105 then the drivers side fan comes on and the temp drops. > i have read the manual and it mensions a bitron sensor. could > this be at fault, checked all the fuses no probs?.the left > hand fan moves free enough also this weekend flushed the rad > out and fitted a new thermostat. new water pump 10 months ago. > any help would be appreciated thanks shaun...p.s. car is a 98 > model.

It should be the sensor. The temp should go to 96, fans on, drop to

1. The 2.0i in my 605 goes up to 100 max. That happens only in the city, during slow traffic. Be careful, the cam heads on these motors don?t really like overheating.

"rockabilly" wrote: > hi all. newbie here and require some help. my 406 2.0ltr > petrol has developed a problem. there is two fans on the front > of the air con rad. the drivers side is the only one working. > wether i use the air con or not?. also the temp goes right up > to 105 then the drivers side fan comes on and the temp drops. > i have read the manual and it mensions a bitron sensor. could > this be at fault, checked all the fuses no probs?.the left > hand fan moves free enough also this weekend flushed the rad > out and fitted a new thermostat. new water pump 10 months ago. > any help would be appreciated thanks shaun...p.s. car is a 98 > model.

cheers mate.. so would you recommend just buying the bitron sensor?. from peugeot. i know which one it is on the thermostat housing.so not a bad job.shaun p.s. just been outside and with the ignition on and unplug the bitron sensor only the right side comes on?.

"rockabilly" wrote: > cheers mate.. so would you recommend just buying the bitron > sensor?. from peugeot. i know which one it is on the > thermostat housing.so not a bad job.shaun > p.s. just been outside and with the ignition on and unplug the > bitron sensor only the right side comes on?.

I?ve heard that Peugeot made 3 different thermostat versions, depending on where the car was sold. The temp usually goes up to 105 and even 110 on LPGs. But 406 people on some Pug forums say that 105 is normal in the city or doing 170 on the freeway. Try asking a Peugeot service, if they say it?s OK, then it probably is. According to Vivid Workshop, the first fan (the one you saw turning) should start turning at 93.5 (96 for aircon) and the second one should start at 101. If the second one doesn?t work, there?s something wrong and this is also the reason why it goes up to 105.

"Fusion" wrote: > I've heard that Peugeot made 3 different thermostat versions, > depending on where the car was sold. The temp usually goes up > to 105 and even 110 on LPGs. > But 406 people on some Pug forums say that 105 is normal in > the city or doing 170 on the freeway. Try asking a Peugeot > service, if they say it's OK, then it probably is. > According to Vivid Workshop, the first fan (the one you saw > turning) should start turning at 93.5 (96 for aircon) and the > second one should start at 101. If the second one doesn't > work, there's something wrong and this is also the reason why > it goes up to 105.

thanks once again. will give my local peugeot boys a bell tomorrow. shaun.

"rockabilly" wrote: > thanks once again. will give my local peugeot boys a bell > tomorrow. shaun.

UPDATE... turned out to be one of the fan relay wires eroded away. centre relay infront of air con condenser.cheers guys...

i've writen that many many times here, sorry couldn't tell you right away so let me guess the botom relay?

it is the use of different materials as copper and iron together accompanied with some salt from wintertimes it makes a nice voltage potential over the conector itself and starts electrical corosion the same you get on ships hulls but then in miniature

it is bad design, you'll soon have to do the other wire in the loom.

best is to solder the whole assembly together and then spray it with a lot of plastic spray

grrzz

marc

It seems that Peugeot just don't understand these aspects of metallurgy. On my 405 there is an aluminium casting holding the thermostat with a steel pipe pressed in to take the heater hose. This had corroded through meaning that the whole casting would have to be replaced. Another one to look out for is the steel clips used to hold aluminium aircon pipes in place. These clips should be removed and little sliver of plastic or pad of insulating tape fitted to break the electrical circuit As Marc has said this is just poor design or perhaps even a cynically placed series of timebombs leading to needing repairs.

It is rather ironic that French scientists such as Leclanche who was responsible for the everyday zinc carbon batteries understood electrochemistry in previous centuries better that Pug designers! Rant mode -off Bob

given pug PSA engines which are simply indestructible i wouldn't expect pug to do such a thing. it is just the french climate being so mild that they seem to forget there are many pugs that have to face salted road conditions . given the latest 307 recall just because of that i suspect designers should be shaken up by now :-) they also could give the wiring contract to Phillips or Stork engineering ( boeing, nortrop, JSF and lots of aviation subcontracts) this would make the wire looms live out the engines and that is a very long time......

who uses zinc carbon these day's... need i say more

Hi,

He was just writing about metal-2-metal reactions.

This problem seems to be fixed now. And remember, all the manufacturers I know had problem with such flywheels (Porsche or VAG among others - Remember the 964 ?).

Regards, G.T snipped-for-privacy@worldonline.fr

205 Diesel & turbo-Diesel :

That?s right. I just don?t see the reason why they took such a risk. Another big no-no are the FAP filters in the newer 406s. I haven?t searched the forum here about them, but I read that they should be changed every 80th. km and they cost cca 2000+ Euros. :?

same thing, happened to early BX models as well as to my 205D which i had for almost 600.000 km the problem with my 205 was that the pvc shield in the looms became more rigid over the years and finally cracked open, some salt in the winter did the rest and it burned down.. managed to drive it out of the garage (while burning) and later when it was extinguished and cooled down I got it to the scrappers on its own... in fact it started right away , it just looked like something from madmax, and that turned some heads i assure you

sad to see her go though.

i recall volvo having similar problems with their 760 series

Hi,

Perhaps it was needed for some marketing reasons (a lighter flywheel gives better acceleration), or comfort (I assume it makes less vibrations, too).

Mmmm, The first-generation FAP had to be changed every 80,000km, the cost is less than 2kEUR (can't remember, sorry, anyway not concerned), now it's due at 120,000km service, but I guess the next FAP will not have to be changed. Some of them, like at BMW's already don't need any additive to work I've heard...

Regards, G.T snipped-for-privacy@worldonline.fr

205 Diesel & turbo-Diesel :