fan only runs with ignition on..this right?

[s2driveruk]

Just a quickie, been like this as long as i can remember but the engine fan does only run with the key in and the ignition on (without the car running). Could this be interupted by the immobiliser

I am guessing this is not correct as if the fan is running and I take the key out it will not restart again.

Any ideas what to look at first? Afterun pump works as I can feel it vibrate slightly and also is pulsed when turning the car on.

Cheers,

David

[audiman]

Sounds ok to me

[s2driveruk]

So if the fan was running with the electrics on and then i remove the key and it stops, wouldn't you expect it to start running again?

[audiman]

Mmmmm, never noticed if it does or not? Cant really try it at the moment either

[s2driveruk]

I'd have thought it would/should do because the temp would have been high enough to start the fan with the electrics on but if it ran for say 2 seconds and then i pulled the key out the temp wouldnt have dropped enough to not want to restart it...plus the fan cycle is like 20 seconds....if i flick the key again it would come back on.

[rotoryboy]

Mine does this also. Park up with fan running, turn ignition off and fan also goes off, Ign back on, no fan!!

[SteveH]

Mine too. Key out and the fan turns off. I've often wondered if this was right

Mine does this also. Park up with fan running, turn ignition off and fan also goes off, Ign back on, no fan!!

[s2driveruk]

ah, feel more comfortable with other having the same.......'feature' maybe its correct then after all, just feels wrong somehow

[Doug_RS2]

It uses a different temp sensor for when the ignition is off - probably different temps.

I used to get the same as you David - it only came on(with ignition off) after a really good thrash.

If you short out the 2 wires that go to the 2 pin temp sensor on your water manifold(mark mod) the fan (and after run pump) should come on for approx 8 minutes after you switch the ignition off.

[s2driveruk]

no, i have never heard my fan come on after taking the keys out...ever, even after a run in near 100 degree heat through the German Black Forest en route to the French GP a few years back

I'll try the test Doug...cheers!

[SteveH]

I tried the fuse trick on the temp sender. Works great, however, my battery went flat after two weeks I think it was due to the number of short journeys I was making in the car.

[mcandmar]

My fan allways runs when i take the key out of my 7A. Sensor on the radiator seems to control the fan when sitting in traffic, sensor clipped onto the rocker cover is for the run-on fan after you lock the car and walk away. I would assume turbos have this too as they even have a second electric water pump that runs when parked

Mark.

Just a quickie, been like this as long as i can remember but the engine fan does only run with the key in and the ignition on (without the car running). Could this be interupted by the immobiliser

I am guessing this is not correct as if the fan is running and I take the key out it will not restart again.

Any ideas what to look at first? Afterun pump works as I can feel it vibrate slightly and also is pulsed when turning the car on.

Cheers,

David

[Sidspud]

I've walked away from my car and heard the fan come on. Normally after going through heavy traffic to find a parking space. It doesn't happen very often, but it does happen.