All Things CAD, Design, Prototyping and Fabrication

Electric Fan

One of the main reasons I went away from the 283 Chevy motor and chose the 4.3 Vortec V6 was to make some room for cooling. I have an earlier Jeep, a 1967 CJ5, so it has a shorter nose than the later CJ5’s and CJ7’s. The 4.3 allows for a bit more room (like, enough room for me to stand) than the 283 did.

When I had Novak redo the wiring harness (they did an awesome job BTW) and reprogram the ECM, I had them put in the circuit for the electric fan. This option has the computer kick on and turn off the fan at a preset temperature and includes the additional relay and wiring to the fan.

Along with the wiring side, I had to get an electric fan. I headed over one of the junkyards down on S. Congress (I think it was Aaron’s – aaronsautopartstx.com‎) in search of a mid 90’s Ford Taurus electric fan to modify and hook up to my modified mustang radiator. After I looked at pretty much every car on the lot I ended up going with a fan from a 96 Pontiac Firebird that had the V6. It had the closest dimensions based on the napkin sketch I had in my pocket.

I almost passed this up originally because it looks way wider than it actually is. Once you start to get it apart. It’s almost exactly the same dimensions as my radiator.

Once I had it home I hacked off the extra pieces I didn’t need prior to fabricating the brackets. Here’s a few pictures before, during and after the unnecessary pieces were removed.

Photo Sep 22, 4 54 23 PM

Photo Sep 22, 4 54 32 PM

Photo Sep 22, 4 57 30 PM

Once I was down to bare bones I test fit the fan. One thing I did not realize before making the cutout for the radiator inlet at the top, was that the fan had a large recess in one of the corners. I made the cut for the radiator inlet but ended up rotating the fan 90 degrees for the final fit. It has a much more factory look now (with the exception of the gaping hole). I’ll have to 3D print a piece of angle to cover the first cut out.

Lastly I used small pieces of aluminum angle to fasten the fan to the radiator. I was able to use existing holes on the radiator to mount the aluminum angles then drilled a couple of holes and used some large fender washers on the inside of the fan to attach the fan to the brackets.

Photo Jan 02, 7 45 48 PM Photo Jan 02, 7 46 00 PM

I’m pretty happy with how it fits up so far. I haven’t test the fan yet as the wiring isn’t setup and I don’t have a good battery. Much better than the mechanical fan with no shroud that I was running before!

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Author: christopherswaim

Habitual learner, tinkerer, welder, maker, doer, and an amateur machinist. Unnatural interest in statistics, mechanisms, bicycles, and Jeeps.

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