Electric fan conversion info.

calahan#2211 · August 28, 2013

There have been post and discussions on here and other sites about electric fan conversions and under drive pulleys. So, I thought I would give some actual knowledge and numbers out there from mine. I installed Steeda underdrive pulleys on a few months ago. I did feel a noticeable difference in a rolling throttle response and when accelerating from a constant cruising speed. Mileage however did not seem to really change any. I do however live in Southern California and there is a lot of stop and go and idling around. The truck did to seem to be happier or less worked when going down the highway. I then decided to convert to an electric fan. The fan I chose is from a 2005 to current Mustang. It could not have worked out more perfectly. I flipped it upside down and mounted it to the factory radiator mounting rails on each side. I even used the factory hardware in new hole locations. I used a Hypertech fan switch for a GM vehicle on the outlet side of the radiator and ran my own control harness. The fan comes on @ 175' and shuts down a 165'. My gauge runs at the same temps and is quiet too. I still have to wire in the high speed side. It will run when AC is on. The best news is. I got a 1.6 MPG average increase on my trip through California. It is a trip I have taken 100's of times and never exceeded 19.2 mpg average. On this trip even with a bit of extra weight I averaged 20.8 mpg... In my opinion it was worth the time, planning and effort. There is definitely a noticeable difference on how it climbs hills/mountains and pulls loads around also. As a note, I was in Fresno with temps hovering from 100'-104' pulling a small trailer helping a friend move his household. The truck never ran hot, acted funny or complained, it just ran flawlessly... :us:

Syco · August 29, 2013

This is an idea I've had when passing by mustangs with electric fans at the salvage yard..I've just never applied thoughts to actions like you did..thanks for the write up

Possumz · August 29, 2013

Was it from a 3.8, 4.0 or 4.6 mustang fan. This is exactly what I want to do to mine. Do you have any pics of it and your controller.
Thanks again for sharing your ideas.

calahan#2211 · August 29, 2013

I believe I have a few pics of the install and pieces on my digital camera. If you send me a PM with your private email I will try to send some. I might even be able to get a close up pick of my electric schematic. The system basically uses three relays. A 40amp relay gets triggered by A/C killing the effectiveness of the thermal switch when A/C is on. Believe me an electrical genius I am not. But, I tried to have a fit and finish that makes it look like Ford themselves could have done it this way. The fan is a brand new Motorcraft unit for a V8 Mustang from Rock Auto. I believe it goes for about $120 or so. I was amazed at how quiet it is when running on the low side. The width of the fan just slides in between the radiator mounting rails and sit just above the fin area. Some trimming was done to the mounting ears and some other molded in tabs around the perimeter of the fan shroud. Nothing any specialty machine needs to perform. :us:

Syco · August 29, 2013

Post the pics up here with photobucket...share with the world..

8pride8 · September 27, 2013

I'm strongly considering doing the same with my 97 5.0... No idea where to begin though. Lol.

2000StreetRod · September 27, 2013

how thick?

According to Rock Auto the motor and fan assembly for 2005 thru 2010 Mustang with 4.6L V8 is MOTORCRAFT Part # RF260. Do you know how thick the fan motor is? I replaced my single row (1 inch thick) radiator with a double row (2 inches thick) and don't have much room between the radiator and the water pump.

calahan#2211 · September 27, 2013

I do know on the '07 and later there is more room than you might think at first. The fan is right at 5 inches from face to back of the motor. My radiator is a two row unit and the fan face sit right on the rail where the tank crimps into the core. I have 1 1/2" clearance from fan motor to water pump alignment pulley tip. Like stated earlier I flip in upside down. The shroud is flat and lines up nicely with the tank flange. The controls are mounted on a sheet metal bracket using the factory mounting nuts on the driver side. It took me a while in my spare time to come up with the plan/execution. I even have a small led wired in to come on with the fan. It will be mounted in the face of my gauge pod. It will be mounted behind the steering directly on top of the dash... :us:

2000StreetRod · September 27, 2013

radiator core to water pump pulley clearance

I have about 4 3/4 inches from the back of the radiator core to the face of the water pump pulley. After removing the viscous cooling fan clutch I have about 4 inches.

I'll have to do more investigating because what you have sounds promising.

Possumz · September 28, 2013

Do you have any diagrams or pictures of the led setup. I would love to have one set up this way.

calahan#2211 · October 1, 2013

"If you send me a PM with your private email I will try to send some." This is a quote from an earlier post... :us:

calahan#2211 · October 2, 2013

Nobody wants for any pics? :us:

BannonJr · October 3, 2013

We would like you to post em here

calahan#2211 · October 3, 2013

I have over 50 pics. I do not belong to, nor do I plan to join any photo sharing sites. I have offered the pics to members who honestly want them. So far I had just one from "possumz" send me a private message quite some time ago. To each his own I guess... :us:

Possumz · November 5, 2013

Thanks again

Thanks again for the info and pics. Sorry it took so long to reply back and thank you. My laptop had died and I lost all my explorer info on it. I still plan on doing the swap with my Lincoln Mark VIII 2 speed fan. Of course i need to replace the fan blade on it as I cracked one of the blades. Now its time to start a new explorer file and save it on my back up drive. Now its time to start collecting diagrams and pics and to get some stuff done. Thank you again. :salute:

calahan#2211 · November 6, 2013

Your welcome... :us:

Jet Ski Puller · November 17, 2013

I'm interested! I sent you a PM for some photos and info.

Possumz, do you know the difference between the Mark VIII fan you are planning to use, and this one?

2000StreetRod · November 17, 2013

high speed current draw?

I think you stated that the fan has two speeds and you wired it so the high speed is activated when the A/C compressor is energized. Do you know how much current the fan motor draws on high speed? If not, what size relay did you use? I think you're using a 40 amp relay for low speed.

I've almost finished upgrading my charging system to a 1/0 gauge wire and a 240 amp alternator. I just need to replace my 175 amp mega fuse with a 275 amp mega fuse. So I'm starting to plan for a pulse width modulator controlled electric cooling fan.

calahan#2211 · November 18, 2013

I used a 40 amp Ford relay to trigger the high/low speed via the A/C compressor. Ford uses 40 amp relays for the fans on the Mustang. But, I have heard that as fans wear in some they can pull a high amount of current when starting up. So, I used Tyco automotive ( 12V ) high amp ( 75 amp ) capable relays for the fan power side of my circuit both high and low speeds. It has so far worked flawlessly... I figure a heavier amp draw capable circuit is more efficient under lighter usage than one that is just enough when new. Over time corrosion and such has a tendency to set in and efficiency drops... :us:

Possumz · November 25, 2013

MarkVIII Fan

Jet Ski Puller said:
I'm interested! I sent you a PM for some photos and info.

Possumz, do you know the difference between the Mark VIII fan you are planning to use, and this one?

Dont know what the difference is between the two. But on theMark VIII it depends on what year it is on whether it is a one or two speed fan. Mine is a two speed from a 1995 Mark VIII that my son had. I want to get all this done but find as I get older I tend to procrastinate and move a lot slow. lol....

Besides I can always get another if need be as I work at Pick-N-Pull.

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