How to hook up Electric Fans to the Air Conditioner (AC) Clutch (Video)

Access to AC wire is easy with wheel and wheel well off

Access to AC wire is easy with wheel and wheel well off

This is part 3 (of 3) of my video series on installing a Griffin Radiator and Spal Electric Fans.  At this point, the radiator is in the car, and the required electronics are hooked up.  This means that the fans operate on a thermostatic control we earlier placed in the radiator.  At this point the fans will only come on when the temp is above 185 degrees.

In addition to this functionality, I also want the fans to come on when the air conditioner is on.  That is what part 3 is about.

From our grey wire, we need to also tap into the green wire by the AC

3rd Relay joins grey wire with AC clutch wire and 2 grounds

3rd Relay joins grey wire with AC clutch wire and 2 grounds

compressor via a 3rd (store bought) relay.  This way, even if the thermostat is not hot enough for the fans to come on, the AC clutch will override this and turn the fans on.  This relay will have 2 wires going to ground, our grey wire, and an additional wire going from the relay to the green wire by the AC compressor.

The installation is not hard, you just should be careful when clipping the wire over by the AC compressor and “tap in” the new wire so it sends the “on” signal to the relay, and therefore, the fans. This part is made much simpler if you jack up the front of the car, place it on jack stands, take off the front passenger wheel and plastic wheel well.

Green wire of the AC Compressor

Green wire of the AC Compressor

I pulled away some of the black sheath covering the green wire, and used a Philips head screw driver to get the wire free from an attach point on the AC compressor.  This gave me more room to snip and tap the wire.

 

 

After everything was connected, I spent some time running tests, and all was perfect!

Green wire "tapped" by yellow wire going to relay #3

Green wire “tapped” by yellow wire going to relay #3

 

 

 

 

 

 

 

So, check out the video, and be sure to check out my other videos, subscribe to my YouTube channel, and like and comment.   Thanks!