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Radiator Fan Not Working


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#1 EdFraguela

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Posted 06 June 2012 - 10:11 AM

Hi all.

Apologies if thistopic has been raised elsewhere before. The radiator fan on my Xsara Picasso 1.6 LX 52 plate (2003) hasn't worked for a while now. I have tried bridging the switch on the front of the block but to no avail. There is a certain amount of play in the fan itself so I don't know if that's the problem. Someone has advised me that perhaps the fault is with the ECU, which sounds a nightmare!!

Any help appreciated.

Ed

#2 fartyass

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Posted 06 June 2012 - 01:00 PM

I have had problems with the engine cooling fan on my 2003 Hdi,I did a post with photographs of the relays & how to test & bypass them.Don;t know what has happened to them after the forum revamp. Looking from the front of the car with the bonnet open,under the front bonnet shut panel close to the drivers side headlamp is a plastic box that contains (from memory) 3 relays that control the cooling fan 1 has control of the fan for aircon & the other 2 have control by engine temp slow & high speed.
You will need a multimeter to determing if you have 12v ariving at the relay connection box (The 12v supply is there regardless of ignition control etc) This is how on a hot day the fan can still run when you get out of the car to drop engine temp.So having located the box & remove the cover to gain access to the wiring & relays The thicker of the wires should be the 12v supply Test with your meter to establish 12v If not you will have to go back to fuse box (dont remember which fuse this is) I have never had 12v supply problems.
On one ocasion damp had got into the box & corroded the relay & replacing it solved one of the problems I had.If you jump the relay connections (I used the earth conducttor out of some 2.5 mm Twin & earth house wire.I think the fan will draw more than 10 amps so make sure you test wire is up to this. Having removed the relay one at a time & jumped the connection the fan should spring to life 2 of the relays have to jumped together to get the high speed fan output. Ok if having established a 12v supply & bypassing the relay still does not get the fan to turn then you will have to gain access to the fan (see your Haynes manual for this) On my fan damp had got into the plug connecter & aplying 12v direclly proved the fan motor was open circuit. I seam to remember a repalcement fan from Citroen was over £120 at the time.I was lucky & got a replacement from Ebay for £10 plus p&p. Without the fan running your aircon will not work as the condenser will not be cooled & the ecu will switch off the aircon because the pressure sensor has signalled the ecu the gas pressure is wrong.
Good luck Farty
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#3 mcdig

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Posted 06 June 2012 - 02:50 PM

This is the thread fartyass is refering to regarding a photo and how to test.
http://www.citroenpi...hl__cooling fan

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#4 EdFraguela

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Posted 08 June 2012 - 11:02 AM

Thanks for the reply. Unfortunately my model doesn't have air con so I believe the set up under the bonnet may be different. I've tried putting a feed directly to the fan and that doesn't turn it so I'm going to have a go next week at replacing it, hoping that this solves the problem. Would anyone know whether it's common for the ECU to cause the fan to break down?

#5 fartyass

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Posted 09 June 2012 - 07:26 AM

I have come across fan problems on Picassos usually due to the fan Motor.If you have put 12v directly to the motor then its a safe bet that the motor is u/s Not heard of any ecu problems causing this,

Farty
03 2l hdi Exc Med Blue + Privacy Glasss (love the car HATE the pit crew)
Yamaha FJ1200(Old girl now but still goes some)
Honda CX500 (Owned 15yrs NEVER let me down
91 Escort Cabriolet for sunny days
2 x Dayang dy 200cc motorbikes on 57 plates
Monkey Bike 90cc
Monkey Bike 110cc 08 reg (most fun I have had on 2 wheels in yrs)
Guess I am into chinese bikes at the moment.

#6 EdFraguela

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Posted 13 June 2012 - 01:36 PM

Well I've just heard back from the garage. They've replaced the fan as there was a lot of play in the bearings, bled everything, run it with and without the cap on and the fan still doesn't run!! It just overheats until I get the warning come on. The garage are stumped and think it's an electrical problem but where do I look? It's all a mass of wires and sensors..HELP!!

#7 Trugie

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Posted 22 August 2012 - 07:10 PM

Can any one advise where i can pick a cheap new cooling fan? mine keeps kicking in but making a terrible grinding noise when stuck in traffic, think it may be a bearing but dont know as im not mechanically minded garage have said will cost £200 give or take for parts and labour but was hoping to get it cheaper, can any one help if they have had this problem before. my Picasso is 1.6 LX No AC

#8 stimulator

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Posted 23 August 2012 - 07:05 AM

trugie and edfru.., look here.
http://www.ebay.co.u...ng fan&_sacat=0
http://compare.ebay....sbar&adtype=pla

the second item is the fans speed control box that goes in the radiator shroud. Edfru if your fan is ok and the sensor then possible the speed unit is dead,

The eCU does control this lot, suggest you buy a Haynes for the wiring diagrams OR look in the local library Haynes.
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#9 fingerscrossed

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Posted 25 March 2013 - 03:50 PM

Did you get this sorted, EdFraguela?

 

My car is throwing fault codes to do with the fan, but as the day has never been warmer than about 4 degrees since I bought it, I've not had overheating messages as yet - obviously I want to get it sorted before the hot summer I ordered arrives.

 

I have been told that the fault is with the cooling fan resistor, but that I need to take the front bumper off to replace it. Sounds like fun :/