TN12valve

This is really cool! Nice job!

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So the thermostat control is mounted, the capillary probe has been routed through the hole I drilled, then zip tied to the wires going down and along the bottom of the fan shroud, as I am going to insert the probe into the fans near the bottom radiator hose. Therefore leaving enough unattached to do this. Position the fan on the radiator. I went to Home Depot and got a few straight brackets with holes, hung them from the original fan shroud bolts, then held up the electric fan shroud and marked where I wanted them, took the fan back out, then drilled holes and mounted the brackets with bolts and nuts, making sure the bolts were pointing away from the radiator that still holds liquid. When I finish, it hangs like this.

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With the fan mounted, I then ran the fan ground up the driver side of the radiator, where it conveniently reaches an existing 10mm bolt that is easily removed and replaced with the fan ground secured snugly, and cleverly, underneath.

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I ran a thick gauge wire straight from the battery to the relay to power the fan (I swear I'll draw a wiring diagram when I get a chance), and ran a wire for the negative of the relay switch.

I ran the negative to a suitable ground not far away.

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I ran a wire to inside the cabin via a rubber grommet, and spliced into the cigarette lighter switched, which is now the switched power source to the thermostat controller.

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The blue wire that goes from the thermostat switch, is also going to go to the air conditioner. That way, whenever the air is on, the fan will run. Without the a/c running, the fan will shut on and off as called for by the thermostat.
Disconnect the wire coming off the compressor, cut it, strip them, then reconnect them with a female connector. This way, you can connect (or unconnect easily later) the blue wire with the diode with a male connector.

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Then reconnect the compressor wire. The diode only let's the 12v from the compressor to the fan relay, but it won't let power from the thermostat go to the compressor, thus eliminating that extra relay that other people have. I'll see what I've got left and try to tie the bows on this tomorrow, along with a diagram. Until then, post comments or questions, and I'll answer them.

dave1123

Just a question, because maybe I'm overlooking something. The power wire from the battery, is it fused?

PocketsEmpty

Neat write-up! I'm considering attempting something like this on my XJ! The relay/diode wiring stuff, you lost me there however lol

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Not currently. I had an inline fuse, but I only had a 30a fuse for it. So I'm just running it straight until I can get a higher rated fuse.

dave1123

IMHO, run the 30 amper until you blow it, then you can refit. I think 30 amp should be enough.

I'm not being critical because you really seem to know what you're doing. I'm just trying to get it straight in MY head.

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The 30a blew right away. The fan motors obviously pull more than 30a. I seem to remember reading somewhere they pull 60a, which is why the relay is rated for 70a.

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BTW, I appreciate you questioning me. It helps clarify everything that I may have left out.

Miceanic

By chance can you get me the dimensions of this set up. I currently have a volvo fan but dont like how much it hangs below the radiator.

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I can measure, but if you look at the picture you can see the space in the top and it's pretty much the same with the bottom