not a bike but really need help with the miss's car

[bombom]

hi guys and girls.

basically the miss's has a citroen xsara picasso thats annoying me.
its a y-reg 1.6 petrol
from the start it was just the fan not kicking as it had seized up. so i replaced that and then all was ok

then a couple of month later i started getting the dash flashing saying engine temperature hot, switch off engine. again the fan not kicking in but the fan is ok.
no damage has been done to engine as its always been allowd to cool down.

now the engine temperature light comes on straight away when switching the engine on when cold.
i was told the temp switch are common on these so i have replaced that and the thermo switch which are both on the thermostate housing but still no luck.

so basically is there anyone with knowlodge of these and can point me in right direction or it looks like il have to call out a autoelectrician

cheers and any help is very much apprecited

[Dr. Quack]

Dash lights coming on straight away are usually fuses or alternator related especially if you know there is nothing mechanically wrong with the highlighted system.

I am wondering if it has an old wax thermostat which is bust and stuck in the closed position. They are well known for breaking.

[bombom]

basically the light thats coming on is the temperature is shooting up into the red (digital dash) and the warning saying "engine temperature, switch of engine"

i dont think it would be the stat as its when its cold so the stat will be closed anyways. iv checked the fuses and all look ok

[jimspeed]

I would think it has to be a sensor OR broken wire maybe, does the car have a low coolant switch too (in the expansion bottle usually) it may be that playing up.
I would check everything to do with the temp gauge (does it shoot up even with ign on and cold engine or just when its running?)
could be a dash fault too I guess
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Hyosung cruise 125(passed test on, sold) Kawasaki el 252 (better than expected but sold on) Kawasaki GPZ500S first "big"bike.(sold) ZZR600 E5..Z750 2007,ER5, currently on a 2008 Enfield bullet electra x and loving it..
,"Alpha-9: Is there any correlation between dyno rod and dyno kits?"

[devojunior]

theres a sensor under bonnet its either red or blue one its a common fault change this and it will be good as new

[bombom]

[MattEMulsion]

It's not uncommon for a fault of this nature on this particular car to be down to corroded pins on the ecu as it controls the entire cooling/temperature/fan system. The solution if this is the case is to buy a remanufactured ecu.

Try the simple things first though but just remember it could be the ecu that is failing.
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Yamaha YZF-R6

[bombom]

yeah looks like im gona have to get it plugged in and then will have to look into the ecu, best bet will probably be getting it repaired if possible.

do you know if i unplug the ecu to check the pins condition, will it loose the code for the key? or are they hardwired into the ecu or something?

[P.addy]