fan cut on whilst parked

[Paul172sport]

Odd one, cars been parked up on drive for hours, just popped outside and the fans running - any idea why, it definately wasnt running earlier

 

[MartinR]

:S did it talk to you when you went out?? seems very weird though!

 

[Adam.]

Better be quick and catch them!

 

[Paul172sport]

its still running lol.

seriously tho, been for a quick drive round and got the temp up to normal, parked up and the fans still running. never happened before and just dont want a flat battery in the morning.

 

[MicKPM]

Check the coolant temp sensor wiring and the fan control relay

Mick

 

[marinemackay2003]

Better be quick and catch them!

juice every where :lolup:

 

[Paul172sport]

cheers Mick, sorry to sound a nob, but wheres the relay and sensor sited?

ive unplugged the fan switch for tonight so il have to play tommorow.

 

[Paul172sport]

just found the guide to change the sensor, is this what you meant Mick?

http://www.cliosport.net/forum/show...-Temp-Sensor-AKA-CTS&highlight=coolant+sensor

 

[barnesautos]

If you've unplugged the sensor , that is all well and good for now, all you need to do now is work out whether or not it was to hot in the engine at the time it was still running.
These cars run an anti percolation feature if the coolant reaches near 105 degrees (somebody quote me if I'm wrong).

Another theory is , if the sensor was open circuit , the fan would run only when ignition on or engine running.
Therefore it would stop when ignition was off , as it is now as you've left it.
But yours was running with the car switched off , so my theory is the sensor was giving the wrong temp to the ECU or it was just too bloody hot.

 

[MicKPM]

If the sensor was in open/short circuit whilst the engine has been running it will default to fan on even when the ignition switched off and the key removed.

My understanding of the problem, and you can correct me if I'm wrong, is that the fan continues to run when the ignition is off and isn't running but as soon as it is on or the engine is running the fan shuts off?

If so I'd suspect a wiring fault to the fan control relay rather than the temp sensor itself.

Mick

 

[Paul172sport]

Morning. Right just plugged it back on and the fan started up again. Turned ignition on still running. Started up and still fans running.

So basically no matter what the fans on.

It shouldn't have been hot as it had been parked up for hours after a drive and the front was in shade as I needed to wash and polish the bonnet and it wasn't on when I was doing that for sure.u

So ideas gents?

 

[MicKPM]

Third time lucky... Fan control relay!

 

[Paul172sport]

lol, i hate electrical gremlins.

is that in the n/s engine bay?

and only yesterday i was falling back in love with it

 

[MicKPM]

Yep, it's in the big black box

 

[barnesautos]

If the sensor was in open/short circuit whilst the engine has been running it will default to fan on even when the ignition switched off and the key removed.

My understanding of the problem, and you can correct me if I'm wrong, is that the fan continues to run when the ignition is off and isn't running but as soon as it is on or the engine is running the fan shuts off?

If so I'd suspect a wiring fault to the fan control relay rather than the temp sensor itself.

Mick

Thanks for the info Mick , I didn't realise these buggers still run when switched
off , but I do understand the anti perc feature when it's meant to be working ok
Cheers

 

[Paul172sport]

Mick you are a star,
ive got 3 in the box, all same part no. 7700414484

do you happen to know which one controls the fan?

off to the stealers shortly to pick one up

 

[Paul172sport]

heres the relays, found some water under the relays, so guess this is the likely cause of failure

 

[Renault Wolverhampton]

oooo my favourite!!!7700414484!!

 

[Paul172sport]

anyone able to confirm which of these is the fan control relay?

 

[Riley!]

Have fan running and remove one by one until it cuts out? Watch your fingers ha

 

[Paul172sport]

fixed.

its the bottom one on the right. marked M

thanks again to Mick for the diagnosis - genius :hail: