Fan override switch

[adamskiTNR]

okay, i have asked this before but i'm really after a guide through this or some clear advice on how to actually do it.
I want to make an override switch for my rad fan to go to my dash. So that it will still turn on automatically but if i want it on i can switch it on. I have seen on other forums that this can be done by tapping into the fan circuit around the relay. Has anybody done this or would know how to do this?
I'm no good when it comes to relay's and the like, good at the actual wiring, just figuring it out is the tricky but. knowing what i need, resistors, fuses, no fuses, relay's etc.
Cheers

[gazwiththevtr]

Hi mate,

I had an old cinquecento ,and the fan was tempremental at the best of times ,so I used a safety pin ,straightened it out and shorted the switch on the fan ,so that it would run constantly ,shouldnt be too hard to make up a switch i wouldnt think ,sure someone will be along shortly to help mate :)

[Lew_C]

Hi mate,

I had an old cinquecento ,and the fan was tempremental at the best of times ,so I used a safety pin ,straightened it out and shorted the switch on the fan ,so that it would run constantly ,shouldnt be too hard to make up a switch i wouldnt think ,sure someone will be along shortly to help mate :)

thats probably not the best advice. lol, slight botch ;)

[Noddy]

This is my area :) http://www.saxperience.com/forum/showthread.php?t=148811&highlight=fan+switch+how Pow! :D

[adamskiTNR]

Thanks. I did do a search, didn't find that though. Been searching the land for that guide. cheers. And the safety pin thing lol. I have done that kind of thing to test them, never to run the car on lol

[adamskiTNR]

So is that "kit" it talks about just a 2 terminal switch and two wires?

[Ashleyp]

but if your driving, then the fan being on won't make any difference as the actual driving of the car will get more air into the engine bay then a fan ever could

and when your parked up, the fan will be on already if the temps are high

i've never seen the point in doing this.

[adamskiTNR]

If the temps aren't high enough to trigger the fan automatically, flick the fan on and the temps will be low before you start your next session or 1/4, so that during that next session it won't overheat

[Ashleyp]

If the temps aren't high enough to trigger the fan automatically, flick the fan on and the temps will be low before you start your next session or 1/4, so that during that next session it won't overheat

some scenario's for you:

If the temps are too low when driving, then you don't want to be pushing the car too hard untill it's up to optimum temp

If the temps are too high when parked up then the fan will come on automatically and aid cooling untill it's back down to a reasonable temp

when parked up at a track day, just lift the bonnet, the temp will go down in a matter of minutes

as soon as you start driving, the car will have bundles of air forced into the bay to aid cooling, but it'll still get hot, something you'd want an oil cooler for.

The fan over-ride switch still doesnt seem needed...

[adamskiTNR]

It doesn't matter how cold the water is in the engine, it's only the oil that has to be up to temp

[Ashleyp]

It doesn't matter how cold the water is in the engine, it's only the oil that has to be up to temp

So, whats your point?

the scenario's I listed above all rule out the need for a fan over-ride switch.

if parked up at the side of a track, the engine will cool down itself if you just turn it off and lift the bonnet.

[adamskiTNR]

And say your doing 1/4 miles and your just going round and round without parking up? i think we'll have to agree to disagree. unless you know how to wire one up

[raunchz]

http://www.mp3car.com/vbulletin/faq-emporium/117895-faq-relays-how-they-work-how-wire-up.html

find the fan relay, and then wire a switch in parallel with it so you can turn it on with a switch, and the auto works - your logic about wiring it up seems right.

I do agree a bit with ashley though - IMO you'd be better off buying a vts 2 fan cowling, fit two fansm wire up one to the oem wires, and wire the other one up with a switch.

So if the car gets how the oem one will come on - but if you want to cool the car down for whatever reason but the oem one isn't on, then just flick the switch.

[adamskiTNR]

Seems a good idea with the twin fans. I'll do this first then should be easy to convert back when i get the twin fans.

[adamskiTNR]

if you want to cool the car down for whatever reason but the oem one isn't on, then just flick the switch.

That's what this should achieve. The automatic fan will still work, but if i want it on i can put it on