electric fan installation

After my previous post i have came to this. Hayden, Inc. 3647 Cooling Fan Control?? is this what i need to install to control my electric fan ( i do not want to use a on off manual switch) and if not or better idea would greatly be appreciated!!! also i have check over these forums but noone gives exactly what im looking for as in how to install a temp control etc~!


i have a CJ-5 258

 

I just installed a factory temp switch, no need to spend big bucks on a controller. Summit lists a ton of switches with different on/off temps. You may need to wire the fan through a relay as most of the switches won't handle the draw of the fan itself.

 

As I understand it, you need two components to power up the fan. First, you need a temperature sensor to go into the water jacket. You'll just have to pick somewhere on the engine to locate this. One possibility is to tee off of the existing temperature sender, or alternately to use one of the CTO locations on the drivers side of the block. I expect these sensors switch from open to grounded when the temperature is reached - so you use them as the ground for the coil on your relay. Next, you need a whomping big relay to control the fan, since they draw a lot of current. The sensor controls the coil on the relay, and the relay contacts power the fan. The relay contacts connect the fan to somewhere in the wiring harness that can supply the heavy current needed for the fan. Pay close attention to the amount of current that the fan needs, which impacts the wire size and where you can tap in for the fan.

There's a brief article on Pirate about the Ford fan, and if you search you will find lots of follow-up there. http://www.pirate4x4.com/forum/showthread.php?t=346676

 

I'd still use a switch inline with the relay, if you play in deep water, or cross streams it's nice to able to turn the fan off.

 

Is this the kind that has the probe that sticks into the radiator?

 

alright well i understand a relay is a must but can i use the probe to insert between the fins of the radiator to measure temp and then wire that back to a relay back into a switch?

edit: im wanting the fan to turn on and off by iteself. and be able to turn it off manually incase i need to cross water. turning it on and off manually would get annoying and sometimes forgetful

 

Some foreign manufactureers (Subuaru comes to mind) put the heat senser/switch in the lower tank of the radiator itself. You would have to run a ground wire as well as power in this case.