So my stock radiator fan went south and I decided to replace it with an electric fan. I am wondering now if I can hook a relay up to the coolant temp sensor for the ECU (at least that’s what I think it is). It's located right by the drain plug; passenger side on the radiator. Pretty sure this is the temp sensor and the one next to the termostat housing is the gauge. Is it possible to rig up my electric fan and a relay to this sensor to get it to turn the fan on at the right temp? Is there a better way of doing this (some sort of fan switch maybe)? Also, i took out my AC when installing my Weber, so now I have the AC fan available. Should i use this fan also to help cool the radiator? Any help is appreciated!

The one in the radiator is a simple thermoswitch, just for the fan. Connects the fan to ground when temp gets high.

 

The ECU doesn't control the fan on the EA cars. The ECU temp sensor is the one near the thermostat with 2 wires, the single wire one is for the gauge.

 

You could use the thermoswitch to trigger a relay (set up for ground trigger) for the new fan.

 

Tip: If you run it though a SPDT w/center off switch you can make it so it's on all the time, switched by the switch, or off (for water crossings)

Awesome thats what i was hoping; i'll tear into it here in a little bit when i get home from work. Thanks

Finally got this going. Got a thermo temp sensor that fit into the radiator that kicked on around 160 degrees and wired up a relay. Good to go now