My fan has been hardwired to always on with the ignition this has been done by wedging a small jump wire into the plug.

I've looked everywhere and can't find where this jumpered plug should be plugged into (once alien wire is removed) but I do have three mystery wires hanging down just to the right of the engine block there's a spade connector and from fist glance two snipped cables but no plug - I also have a three pin plug that's lingering further over to the right similar in appearance to the ECU diag port but without a rubber cover. (it's not the ecu port as I can see that this one is lower down)

Any ideas what's going on?

With the fan disconnected the engine warms up as expected. As far as I can tell thermostat is fine, water pump is fine so can't work out why this has been done.

Where the fan has been running all the time it's rough as nails now and sounds like the bearing has gone (it sounds like rattly grinding metal ) will the fan from a 900cc fit a sporting? Are they the same?

I also need to replace the rad - it sprung a leak the other night (after discovering the above) I'll be getting a replacement from my local motor factors later today, can't afford to wait any much longer without a rad!





I love Fiat cars - just wish they'd give me a chance now and then

hi.

sounds like the car has been fitted with the radiator from an MPI seicento. On the Cinquecento, the fan is controlled by a thermostat in the side of the radiator, on the MPI seicento this was blanked off and the fan was controlled by the ECU.

On the Cinquecento the switch is just above the water pipe, facing the middle of the car;

like this;



but it should be green and only have two connections in there (that'll suit your random wire you've found, but can't plug in!) Mine is a little different because it runs a different type of switch, but it is essentially the same.

So when you're getting the new rad, get a fan switch for it as well - and all will be fine

The fans are the same on all models of the cinquecento and any SPI/Mk1/Pre (2000?) 2001 seicento. I'm not sure on the MPI / post 2001 seicentos

Cheers Arc!

Picked up new rad totally forgot about gettinng a new fan switch - I'll try the one in my busted rad and see what happens.

Also noticed the temp guage doesn't work! I had assuemed it was due tothe fan being on all the time - but with fan disconnected today the guage didn't budge - anyideas where to start for that one?

Cheers to you all!

im fitting a new thermostat should hopefully get a better reading on the temp guage as mine sits on 50 degrees till it starts to over heat then it shoots up lol.

jenks69 said:

Cheers Arc!

Picked up new rad totally forgot about gettinng a new fan switch - I'll try the one in my busted rad and see what happens.

Also noticed the temp guage doesn't work! I had assuemed it was due tothe fan being on all the time - but with fan disconnected today the guage didn't budge - anyideas where to start for that one?

Cheers to you all!

Click to expand...

np

temperature gauge.. open the bonnet and looking at the engine, on the back left hand side of the head (just down the back from the oil filler cap) there is a sensor that should have a single wire connected to it. Check if it is connected. If it is, then remove it and touch it to the a metal bit on the engine. Check to see what the gauge does (might need two people to do that). If the gauge hits the top then it and its wiring are fine,and you have either the wrong sensor in there (the cinq s doesnt ahve a gauge, just a light driven by a different type of sensor that comes on when it overheats), if the gauge doesnt move.. you have a fault somewhere else (but i've never seen one fail on anything other than the sensor)

sounds like more then fitting a jumper where the thermostat was has been done!
the fan is not switched on on the cento it always has power with the ignition on or off.
alot of cars with electric fans are like this. thats why sometimes you can hear the fan spinning in parked car thats just been turned off.

I'll test the wire on sunday - busy tomorrow and it's too cold / dark to do it now! LOL

Cheers once again :worship:

Update:

The guage shot up to red hot when I grounded the cable that goes to the sensor on the rear of the block - so I guess I need to replace this sensor?

I grounded one of the horn terminals then jumped a wire to the + on the battery and got nothing so I guess it's new horn time?

Whilst the bumper was off I got a few pics that I need help with please: :worship:

This pic shows 3 wires that are just lurking behind the bumper! any ideas?



This pic shows a plug that I think should be connected as the ECU diag plug (top of the pic has a cover over it) this one doesnt.



I also noticed that this tube that goes into the air filter gubbings was crumpled at the bottom, I've taken it off - does anyone think this will cause any issues?



I found this under one of the seats! I assume it should somehow be connected to the tube above??



This is where the tube was:




I really appreciate everyones help on this!

IS your horn working?

I think in the first picture, that plugs into your horn on the right.

Ming

those are defo not the horn wires - they are connected in the pic you just can't seem them.

the horn doesn't work but there's power to the cables that connect to it when I press the button.

Dim dip relay wires, should be attached to that resistor above the horn.

Cheers

PD

and the wire you think is for ECU diag is the electric headlamp adjuster wiring. most cinqs have them but few have the hardware installed to use them

rallycinq said:

Dim dip relay wires, should be attached to that resistor above the horn.

Cheers

PD

Click to expand...

There's no resistor just the remnants of a smashed bit of plastic on the middle wire. What is it used for - the lights all work fine

arc said:

and the wire you think is for ECU diag is the electric headlamp adjuster wiring. most cinqs have them but few have the hardware installed to use them

Click to expand...

Cooleos - nothing to worry about then! Phew!

thank you both!

The resistor is supposed to put the headlamp dipped beams on to a dim setting when the parking lights and ignition are on together.

Cheers

PD

rallycinq said:

The resistor is supposed to put the headlamp dipped beams on to a dim setting when the parking lights and ignition are on together.

Cheers

PD

Click to expand...

As far as I can tell that seems to work with out those three wires connected - the top left wires in the red circle has the remains of a plastic housing and resistor on it! I'll wait till xmas and then I get my haynes manual :slayer: I'll fix it then!

Will do temp gauge sensor and horn ASAP!

lol haynes manual is as about as usefull as a buying a watch for a blind person.

craigb244 said:

lol haynes manual is as about as usefull as a buying a watch for a blind person.

Click to expand...

How so?

the wire colours were no totaly different to what both my centos have. there is missing connections (usualy where the colour confusion starts/ends) basicly the thing is FULL of errors on both electrical and machanical sides.

its ok for refrence but just take everything with a pinch of salt and if you are going to dig deep into something, be sure to take photos and notes

Get a Porters them

Cheers

PD

I have Haynes, Porters, Factory Cinq Manual (in Italian) and Factory Sei Manual. I use them all, but use the Haynes the most.

It's not perfect, but is the easier for most stuff. Quite often the guides here are better than anything else.