4.0 fan clutch replacement?? - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 01-04-2011
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4.0 fan clutch replacement??

Can I get some help with this?

I've been noticing this really annoying sound coming from my fan I am told it is the fan clutch and I'm going to reLace that and the fan... I was wondering instead of buying factory parts can I upgrade them to get better performance or is it not worth it???
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Old 01-04-2011
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I ditched mine all together and go electric. You'll free up a little power and bump the mileage a bit too. If not, a thermal replacement from any of the major auto parts stores should do.
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Old 01-04-2011
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What's so special about the electric fan?
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Old 01-04-2011
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The factory uses up some horsepower to run since it's always being turned when the engine is running.. The electric warms up quicker, runs only when it's turned on. The less accessories the engine runs, the more you free up in power/mileage. That's why most cars have switched to electric fans.
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Old 01-04-2011
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That sound like a better way to go. Now this may be a dumb question but I'd rather ask it now then deal with it later . When do you turn it on and off ? Im new to the electric fan so cut me some slack .
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Old 01-04-2011
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Originally Posted by MikeDevo View Post
That sound like a better way to go. Now this may be a dumb question but I'd rather ask it now then deal with it later . When do you turn it on and off ? Im new to the electric fan so cut me some slack .
There's usually a temp sensor that turns it off and on, others also wire in a manual switch( good for water crossings if you offroad).

Don't forget that you are putting a load on the alt, which in turn robs the engine of power. Which is greater (more draw from the alt or mechanical clutch) I have no idea.
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Old 01-04-2011
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You can get a fan switch the turns on 10-15 degrees after the thermostat opens and turns off right around when the thermostat would start closing again. So, if you have the factory thermo, they can open somewhere between 192-197, get a switch that turns on around 200-205. That way it will regulate and won't stay on all the time or run too hot. For the most part it will run while you sit in traffic. It will cool enough on it's own while you are driving. Also, get one that has the a/c option. That will turn it on anytime the a/c compressor is engaged or it won't cool. Find a 16" fan that is at least 2000 cfm and higher. The higher the better, it'll cool better. Zirgo makes some decent fans for the price/cfm rating. 3000 cfm for around $100.
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Old 01-04-2011
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There's usually a temp sensor that turns it off and on, others also wire in a manual switch( good for water crossings if you offroad).

Don't forget that you are putting a load on the alt, which in turn robs the engine of power. Which is greater (more draw from the alt or mechanical clutch) I have no idea.
The alternator draw is less than the fan. And the electric isn't running all the time.
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Old 01-04-2011
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Wait a second your saying that the electric fan is robbing more Power from the alt?'or the clutch is??
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Old 01-04-2011
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Clutch/fan sucks up more power.
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Old 01-04-2011
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Sorry didn't see that in time
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Old 01-04-2011
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One more dumb question. So if i get the e fan then I'm not going to have to replace the clutch, right?
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Old 01-04-2011
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Yeah, you'll remove the fan/clutch and shroud. I bought an aluminum shroud from Jegs and modified it to fit the radiator and mounted it. Some people just mount the fan without a shroud and it works well but I have the supercharger so I wanted it to be more efficient. I was going to post a pic but I guess I deleted it from my computer. I suggest get some mounting straps to mount the fan and not use the plastic rods that mount through the radiator. The plastic rods can wear a hole in the radiator and are a pain if you have to service/remove and replace the fan.
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Old 01-04-2011
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The alternator draw is less than the fan. And the electric isn't running all the time.
A mechanical does not run all the time either, at least ones with viscous couplings don't.
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Old 01-04-2011
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A mechanical does not run all the time either.
The clutch may not be engaged but it is still being spun by the crank. If I'm not mistaken, Rangers use thermal fan clutches, unless they've upgraded in recent years.
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Old 01-04-2011
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I'm having a hard time finding a 16 inch fan any links you guys got ??
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Old 01-04-2011
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Old 01-05-2011
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Thanks for the help ! I'm buying it tonight and getting it overnight shipped install tomorrow hopefully !! Wish me luck
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Old 01-05-2011
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Don't forget a fan switch/controller. I've had good luck with the Hayden ones.
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Old 01-05-2011
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Yeah I'm gonna get them found them for I think $36. Sound about right?
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Old 01-05-2011
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I used to get them at Pepboys for around $30 but things have probably gone up. If you got the non-adjustable one, you can play with the placement of the probe to get it to turn on at higher or lower temps, depending on how far or close to the return hose on the radiator.
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