How would you hook up a manual switch for the radiator fan? Simple question. Hehe.

Thanks.

 

yea i would also like to know
so bumb

 

Get you a toggle switch from one of your local car stereo shops, or automotive stores. It will most likely be a 3 prong switch. One will be constant power, one will be your accessor(radiator fan), and the other will be the ground. On the prong that is used for constant power, run it to a source of constant power (on all the time). The wire that you are going to be using to run to you raidator fan is going to be the accessory wire. You are going to have to find out which wire on you radiator fan is positive by using a test light, then tap into it. Finally, ground the toggle switch to the frame of your car.

 

easier way to do it is to find the two wires on your thermostat housing and run a switch from one to the other or one of the wires to ground. unplug the switch and with the ignition on use a test light and probe the plug you will see the fans turn on.

 

will the fan also come on even if i don't have the switch on
( i only want to do this because i just put a thiker rad in and the fan takes long to kick on i want to use the switch when i go to the track so after a run i can have the fan running but don't want to do any electrical dammage eg back surge or somethin)
thanks

 

From your temp sensor the wires run into a relay which is negative triggered. So all you need to do is run one wire into the car to the switch, and the other prong on the switch to ground. You need to find out which wire it is that triggers the relay though. I have mine hooked up but I cant remember off hand which wire I tapped into. And I cant go look because it is up at my shop. If no one answers by the time I get a chance to see which wire, I'll post back up. And yes, the fan will function normally if the switch is off also.

 

YEs, you should use a relay since most toggle switches will not be able to handle the current of the fan when you first turn it on and is under the most load.

You will get heavy arching inside of the switch which cause it to burn out.

 

Wow! Some really creative and involved methods of triggering a fan. Anyways, you can ignore most of what has been suggested. The thermo switch that turns on the fan comlpetes the fan cicuit to ground when the temp is high enough. So... all you need to do is piggy-back a wire from the non-grounded side of the thermo switch, run that wire to any single pole toggle switch, and the other side of the switch to ground. You can then manually turn on the fan, and if you don't, the thermo switch will still do it for you when needed.

 

Ahh, thanks for the replies. I will definitely do that. But now it seems my thermostat is the culprit. I'm gonna run to Sears and pick me up some nice new tools and fix it. (Friend got pissed off so he finally took all his tools back)