Electric Cooling Fan How-to
 

To read the original thread and discussion on this topic go here- LINK

Hey folks, this is my electric cooling fan mod to my 92. I started with a mopar replacement fan (part # CBG4F250). I ordered it from moparone.com it was about $50 shipping and all. I got the relay kit off ebay, a guy called abad71camero, superfast shipping, for $30 +/-. I figure $80 and 1 afternoon is a heck of a deal for an electric fan conversion.

So, I started by taking the upper shroud off, the clutch fan, then the lower shroud. I did not drain or remove the radiator.

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I bolted the upper and lower back together and put the fan on top to get an idea how i could make it work.

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Re: Electric Cooling Fan How-to
 

Next I put the fan inside the shroud and put it back in the truck to see how much clearance i would need in front of the water pump. I pushed it forward as far as it would go without coming out of the round part. I marked all three tabs, and used a dremel tool to cut three slots in the shroud.

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Re: Electric Cooling Fan How-to
 

After that I cut some strips of 16 or 18 gauge sheet metal. bolted it to the holes in the fan and then ran some tech screws through the shroud and into the strips.

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This is the finished product.

http://67-72chevytrucks.com/gallery/...093/ry_409.jpg

Re: Electric Cooling Fan How-to
 

Then I reinstalled the fan and shroud as a unit. It was pretty difficult with the heater hose and upper radiator hose in the way.

Here's the relay kit I used

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I decided to mount the relay on the fire wall next to the fuel pump relay. I mounted the circuit breaker to the right of it. I picked up the hot for the fan and the relay from the terminal strip on the left.

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I ran a #10 wire from the relay to the cooling fan for the hot and grounded the other side of the fan to the core support.

Re: Electric Cooling Fan How-to
 

The last thing to do is put in a temperature switch to turn the fan on and off. there is a black wire from the relay that goes to the temp switch (it looks like a temp sensor, but it actually a switch that activates at specific temperatures).
I was going to put it down on the passenger side head where the sensor for the guage goes on the driver side. But i was unable to get the plug out. So i got a thermostat housing off a 70s model 350. It had a threaded hole just the right size, well kinda. The hole is 1/2" pipe thread and the switch is 3/8" pipe thread, so I had to use the supplied reducer.

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Well the housing worked great for the temp switch but caused lots of problems with the upper radiator hose. I had to cut it in 2 places, rotate 1 end, cut a piece out of another hose and slice it together with some 1 1/4" tubing. here's the pic.

http://67-72chevytrucks.com/gallery/...093/ry_413.jpg