How to switch on the electric fan when the car to hot
Turbo Mini Forums

Hi need some help , running metro turbo engine in mini , fitted a Eletric fan in the inner wing where do i iput the switch to turn it on and what sensor do i need ,is there one built into the turbo lump some where or ready ?? What do I need any advice welcome . Alex

Most rads with fans have a built in temp switch boss. The standard mini rad doesn't if you buy the really late mini rad it does have a boss for a switch.

If you have a megasquirt, or any ecu, you can usually control fans from them too.

http://www.twin-turbo.co.uk
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A man without a project is like a like a woman without a shopping list.

Have a new mini spares rad part c / ARA 4442 ? What switch / sensor do I need ?

Not using ecu

Not using ecu

if the electric fan is supplementary u could drill the thermo houseing if its a small sender check first

just wire a switch to the dashboard.

balls to the blower!!!



1330,stage3 head, gt1549, canems ecu, S/C box and drops

Most don't bother with a sensor for an extra fan. If its getting hot in traffic just a switch in the dash should be ok and keep your eye on the temps.

so long as you dont forget to turn it on of course

I'd be surprised if there is a modified mini owner who doesn't stare at the temps in traffic!

Even pretty unmodified ones do that too haha.

You could get something like this:
http://www.ebay.co.uk/itm/ELECTRIC-COOLING...Y-/161189039773

Wire one leg of that switch from live (fused, I would do it permanent to allow for cooling after shutdown, but that's personal choice), then the other leg to the switched live feed on a relay. Connect the other side of the relay to earth, then a suitably sized live from the battery or starter solenoid to the relay feed in (fused again), then the same from feed out to the fan, then the other fan wire to earth. Just make sure you have the fan polarity correct.

Edited by Carlzilla on 23rd Jan, 2014.

to be honest id not bother with running wires inside the car, just use a temp switch like the link perhaps use the coolant drain plug for the sender/switch

you may find you'll relax rather than being stuck watching the dash bored..