cooling fans

[ggt]

is it posible to have fitted a timer that keeps the fans running for a short while after you have switched of the motor, or is this a bad thing to do. If this is a silly question forgive me as i am not mechanical minded. Thanks Gordon.

[bigphil]

It is possible but can't see why you would need it.

[T88CAN]

The fans take the temp from the ECU so i reckon it could be more difficult than you think

[bigphil]

You are correct thats why I said 'possible' and not easy.
Just can't see what would be acheived.

[GreenV8S]

The ECU drives the fans via a relay (one per fan) so presumably some sort of courtesy light delay type affair could be used to stop the relay from opening immediately when the ECU switches off. You would also need to ensure the relay had a permanent live supply not ignition switched.

[Mustang Baz]

Turning this on its head a little - is there anyone who has fitted a fan override system which would allow advance activation of the fans pre-traffic jam/slow down? Have a friend with this on his Griff and he swears by it.

[powerlord]

why ?

but assuming you wanted to (the switch rather than the advance on). It'll be via a relay. So you just add another relay (or two if you want a switch for each fan), and connect em up to the existing 12v in to fan. switch on, relay on, 12v to fan...ECU putting 12v on makes no difference. Easy job. 2 relays, some wire and a few switches.

Still don't know why you'd want to this this mind. I mean if it's for the reason mine has sometimes:

Basically I think when it is hot and the fans have went on then off and it's switched off residual heat in the engine can rewarm the coolant and causes a bit of a pressure leakage from somewhere or other.

I don't think the fans on with the engine off will help this though cause the residual heat is in the block. And with no water pump on, cooling the small amount of water in the radiator isn't going to achieve much.

Remember the system is under pressure, so hinting 100 is not bad. As the manual says... summit like >110 or something is the worry zone (dunno what pressure tuscan runs at, but say at 20psi it wouldn't boil till 133c).

[ggt]

powerlord said:

why ? but assuming you wanted to (the switch rather than the advance on). It'll be via a relay. So you just add another relay (or two if you want a switch for each fan), and connect em up to the existing 12v in to fan. switch on, relay on, 12v to fan...ECU putting 12v on makes no difference. Easy job. 2 relays, some wire and a few switches. Still don't know why you'd want to this this mind. I mean if it's for the reason mine has sometimes: Basically I think when it is hot and the fans have went on then off and it's switched off residual heat in the engine can rewarm the coolant and causes a bit of a pressure leakage from somewhere or other. I don't think the fans on with the engine off will help this though cause the residual heat is in the block. And with no water pump on, cooling the small amount of water in the radiator isn't going to achieve much. Remember the system is under pressure, so hinting 100 is not bad. As the manual says... summit like >110 or something is the worry zone (dunno what pressure tuscan runs at, but say at 20psi it wouldn't boil till 133c).

That is the answer i was looking for i thought that if you fitted a timer it would help with heat soak. Thanks to you all.

[Mr Freefall]

Mustang Baz said:

Turning this on its head a little - is there anyone who has fitted a fan override system which would allow advance activation of the fans pre-traffic jam/slow down? Have a friend with this on his Griff and he swears by it.

Mark Adams have made one for the speed 6, that does a this, and makes sure that air gets to the back of the engine. He did say it was not cheap when he was telling me about it, but give Paul a ring and Austec and he might be able to give you a price...

Mr F