Radiator fan switch?

[Tiamat-red]

Is there an easy way to wire up a switch to the cooling fans to operate them manually?
Or maybe even just one?
I have a tranny cooler on the passenger side in front of the radiator and would like to be able to at least make that fan come on when I wanted...

[Trevor]

Originally Posted by Tiamat-red

Is there an easy way to wire up a switch to the cooling fans to operate them manually?
Or maybe even just one?
I have a tranny cooler on the passenger side in front of the radiator and would like to be able to at least make that fan come on when I wanted...

Yes, by using a switch, supplying a double pole relay or two blocking diodes.

But why would you want to go to this trouble? Are you having cooling problems? I have a cooler fitted directly to, and in front of the radiator, for seven years without a problem.

[Tiamat-red]

I'm not having cooling problems as far as the engine temps.
The tranny temp will get up over 200f when going slow(behind traffic) up some of the long steep hills/mountains around here.
At least that's according to my temp sensor in my aftermarket tranny filter.
Which is a little warmer than I would like to see it.
Especially after long (3 hour+) trips and heatsoak has set in...

As far as I know the fans work fine.
I was just hoping I could just flip a switch and watch it go down...

[Trevor]

Originally Posted by Tiamat-red

I'm not having cooling problems as far as the engine temps.
The tranny temp will get up over 200f when going slow(behind traffic) up some of the long steep hills/mountains around here.
At least that's according to my temp sensor in my aftermarket tranny filter.
Which is a little warmer than I would like to see it.
Especially after long (3 hour+) trips and heatsoak has set in...

As far as I know the fans work fine.
I was just hoping I could just flip a switch and watch it go down...

Not a bad idea Matt.

I trust that you use third gear rather than drive, under the conditions of high temperature which you mention.

It should be more straightforward if you use a double pole relay, one pole switching each radiator, as each circuit must remain independent of the other. Pick up a feed from an under dash, only ignition on circuit, and feed this to a switch. If you can use say an existing audio wire, so as to not have to cut into a loom, this would be ideal. Current requirement will be minimill, as only a relay will be switched.

Run a light wire from the switch to the coil of a 12 volt relay mounted close to the fans. The relay should be arranged to switch a fused positive supply, (An inline fuse will be an easy option.) divided out via two contact sets to the two fans. If you require any other info just shout.

[Tiamat-red]

Sounds easy enough.
Thanks!