Hi Guys.

I've got a 2001 Seicento 1.1 (1008) 8v

I've just finished putting the car back together after the head gasket went due to the fan not kicking in.

The fuse under the dash is fine
I've fitted new relays
I've fitted a new temperature sendor unit (temp sensor)
I've tested the fan with direct power and it works perfect.

Does anyone know what I have missed????? :bang:

I really don't want to have to wire in a manual switch because I'd rather not bodge it.

Please help guys?

Is it the SPI or MPI engine? SPI is controlled by a switch in the radiator, MPI is controlled by the ECU.

2001 so will be mpi - never messed with one so i am less than useless here but Eklipze is correct, it is controlled via the ecu on the mpi and not a simple fan switch like on spi.

You can test the fan on Mpi via the OBD with multi ecu scan

Alternatively, remove the connector to the green coded temperature sensor (extreme thermostat end of the inlet manifold). From cold, start the engine. If the fan doesn't come on within a minute, suspect the temp sensor.

However, the fuse for the rad fan (check this first!) is behind the battery, together with the power steering fuse (2 maxi fuses) not in the dash -- so check that first.

fingers99 said:

Alternatively, remove the connector to the green coded temperature sensor (extreme thermostat end of the inlet manifold). From cold, start the engine. If the fan doesn't come on within a minute, suspect the temp sensor.

Click to expand...

I've tried this and IIRC it doesn't switch the fan on

Edit: Although I'm not 100% sure the fan was working at the time

Hmm. Should come on -- it's a failsafe of sorts.

Should have said "if the fan doesn't come on, suspect the wiring".

fingers99 said:

Alternatively, remove the connector to the green coded temperature sensor (extreme thermostat end of the inlet manifold). From cold, start the engine. If the fan doesn't come on within a minute, suspect the temp sensor.

However, the fuse for the rad fan (check this first!) is behind the battery, together with the power steering fuse (2 maxi fuses) not in the dash -- so check that first.

Click to expand...

Thanks.

I removed the sensor plug and bridged it. It worked. so I know the wiring is ok.

The fuse behind battery is fine.

Also tried removing the thermostat but didn't do anything,

This has got me boggled.

As for the OBD I only have the newer OBDII scanner

What else could it be?

Where is this sensor?

2001 should be an MPI car. Bridging the sensor should do nothing useful.

How many injectors does the car have? (Need to be sure whether it's MPI or SPI.)

I don't think anyone mentioned removing the thermostat.

If the car is SPI (one injector, square air filter housing, more in the FAQs) and shorting the fan switch on the radiator (MPI cars don't have one) triggered the fan, then the switch is faulty.

But 2001 should be MPI car.

I just tried the thermostat on a hunch.

the car is an mpi, it has 4 injectors, only 1 temp sensor/sendor attached to the rear right of the cylinder head.

I unplugged the sensor then turned the car on then off and the fan kicked in after i removed the key, so i now know the wiring all works (no broken connections)

i've been at this car for over 2 weeks (waiting for parts too) and i'm getting close to buying 5l of petrol and a lighter :/

jforster91 said:

I unplugged the sensor then turned the car on then off and the fan kicked in after i removed the key, so i now know the wiring all works (no broken connections)

Click to expand...

Best guess, the temp sensor has gone down. eurocarcare.net or Shop4Parts are usually very quick. Sometimes I think that Big Mick is Psychic Mick and boxes up my parts before I ring him.

jforster91 said:

i've been at this car for over 2 weeks (waiting for parts too) and i'm getting close to buying 5l of petrol and a lighter :/

Click to expand...

If it was a Cinq, I'd be worried!

hi there got similar problem. just phoned fiat and been told that there's a resistor in the fan unit. if this fails the fan will work if you put 12v though it, but not while in the system, if that makes any sense?

I think Fiat have some crossed wires in communication.
Resistors in the heater fan but not the radiator one.
Fan fed by Maxi fuse through orange relay that is switched by Ecu.

Get a multimeter and set to bleep. Connect to fan connection pins on the fan and turn the fan by hand slowly. You should get intermittent bleeps as it turns indicating continuity through the brushes.

just taken my fan apart and noticed this, as soon as I find some more info on it I will try to update peeps

just taken this pic of it

sorry for another post, just a better picture

Before taking it to bits, did you put 12v directly across the fan?

D