who has ?and how does this?

 

I installed an electric fan in my old Chevy 6.2L diesel and got an improvement of ~1/2 mpg. I suspect that similar results can be realized within any similar implementation.

I used a thermistor attached to the manifold coolant crossover to signal the fan controller. The temp. was set at 200F. About the only time the fan came on was during stop-and-go traffic, particularly on a hot day.

 

what fan did you use? my truck is a 5.4l

 

I used a single 20 inch universal fan assembly on the old Chevy. A diesel puts a lot less heat into the water jacket compared to a gas engine so you will need all the flow rate you can get, probably 4000cfm or better. You might adapt a fan assembly from a Crown Vic P71 or similar to get the capacity needed for your rig.....or this:

http://www.flex-a-lite.com/auto/html/ford-truck.html

 

i heard...not sure if its true cause my friend runs his mouth....but our 5.4 would gain like 20hp when swapping to an electric fan

 

thats one of my goals!(I hear 8/15 hp gain)

 

Just throwing this out as the other side of the story, nothing else.
I had friend that switched to an electric fan. It did not come on in traffic and his engine overheated and warped the heads before he realized what was happening but that is probably a rare event and he should have been paying attention to his indicators.
A Ferrari mechanic told me people who used electric fans should set them to run all the time and to bypass the thermal switch.
I am thinking about a universal electric fan but only as an additional cooling source for stop and go city traffic to boost AC output since it gets over 100 here during the summer. No way would I do away with an engine belt driven fan. On large engines those electric fans just don't have the size or output to deal with it in my opinion and they put strain on the alternator, vibrate, and are noisy but they are fine for small engines like a 4 cylinder. I have a Mercury Villager that is as quite inside as a mouse, until of course the electric fan kicks in then you can see the voltmeter drop, feel the vibration, and hear it run.
What I say may not apply to everyone and many have had great success with electric fan conversions, but that's not for me personally. As the daddy Bush character on SNL says " Not gonna do it, wouldn't be prudent, at this junc-ture"

 

I believe it, and have heard 15-17 hp a few times. From my seat of my pants it feels like it.

 

i put a 14in fan on my 03 dodge 1500 with a 4.7 with a themo switch that would come on anytime the a/c was on and when the temp got to 185 and it was fine never once overheated i plan on doing a e-fan install on my f150 also btw i gained a solid 1-2mpg on the dodge

 

so its a good idea pretty much as long as you hook it up the right way instead of ghetto riggin it to a mech. switch...hmm....somethin i may ponder about