• Welcome to ClassicBroncos! - You are currently viewing the forums as a GUEST. To take advantage of all the site features, please take a moment to register. It's fast, simple and absolutely free. So please join our community today!
    If you have problems registering or can't log into your account, please contact Admin.

Electric fan VS manual fan

Mrsalesco

Newbie
Joined
Mar 27, 2014
Messages
5
Electric fans are really noisy. Really, really noisy. I avoid running them unless I have a car that will not stay cool no matter what else I try. The best cooling "mod" I did was I have an extra thick, extra pass radiator (stock tanks but a twin pass core I think) and the Explorer serpentine drive with the Explorer plastic fan in the stock shroud.

I do not make a lot of power but even on the hottest 95 degree days of summer sitting in traffic it sits on 195 and never moves.
What is your engine? I’m running stock (except .040 over) 351W, 2 core(1.25”tubes), aluminum radiator. Idling in traffic on hot summer days hits over 210 degrees then I rev up rpm’s to cool it off. Not good!
 

DirtDonk

Contributor
Bronco Guru
Joined
Nov 3, 2003
Messages
44,001
Hey there. Way to go finding an old discussion that’s pertinent to your issue. Good searching. And fun to see an old discussion like that and what we were going through at the time.
But just so we’re clear here, 210 is not bad. It’s not only not overheating, but it is in fact where modern engines tend to run from the factory.
Even though many of our engines had 180° thermostats, it wasn’t long after our trucks were built that they went to 195’s instead. Which is what a lot of us use in our Broncos today.
So you’re not in any kind of a danger zone if you were concerned.

The fact that it cools down when you rev it up is actually a good sign. That means most things are working and your .040” over 351 is not experiencing hotspot issues.
Or at least not bad ones.

Over-boring Windsor engines has been problematic for decades.
Sounds like yours is not one of the problem engines with core shift issues.

Do you know what thermostat you are running? Is it a 180 or a 195?
When you rev the engine and the temperature comes back down, does it go to the rated temperature and stay there as long as you’re driving around?
Maybe a little aux electric pusher fan would be a great thing for the stoplights, but with the limited space that our rigs offer, there are not many options.

Sounds like your set up is pretty nice, but may be a little testing is in order.
If you’re driving around sometime and pull up to your house and idle it, see if the temperature comes up. If it does, pop the hood open and see if it comes down on its own without having to increase the RPM.
If it does then perhaps one of those other options such as the fender skirts, radiator ducting, hood louvers or electric fan would do the job.

If it doesn’t come down on its own, or frankly just to check anyway, you might just verify your ignition timing while you’re at it.
Advance it as far as you can and still have it run right.
That usually helps engine cooling even at idle.

Good luck!
 

DirtDonk

Contributor
Bronco Guru
Joined
Nov 3, 2003
Messages
44,001
Probably. Depends on the thermostat and how it runs normally.
If you only want it to come on when there is a special need, you might have it come on 15 degrees above normal and turn back off 5° above normal or something like that.
Lots of possibilities and ways to do it.
 

Timmy390

Bronco Guru
Joined
Jan 1, 2011
Messages
5,282
Loc.
Conway, AR
My 2 speed fan is controlled by my SN95 ECM. Don't quote me but I think low speed kicks ar 205 and high speed at 220. Running a 195 stat and it runs a steady 210 when driving. Creaps up to 220 in the summer heat and stop/go traffic but the fan goes on high and she cools back down.

Tim
 

blubuckaroo

Grease Monkey
Joined
Jun 11, 2007
Messages
11,765
Loc.
Ridgefield WA
Lots of information here. I'll admit, I struggle with an unfounded bias against electric fans. However, in the old days, you would never leave the car idling in 100+ weather with the A/C on while someone went into the supermarket for 30 minutes or an hour. Electric fans made that an option.
However, I just went to a huge car show where there were lots of electric fans, but none had a shroud. Just throwing on an electric fan isn't going to work. It needs the same "full radiator" shroud that a mechanical fan needs.
Also, any functional electric fan is going to require an alternator upgrade.
I've seen this Derale fan with a custom shroud at WH. I'm wondering how this works out with the two speed controller?
https://www.wildhorses4x4.com/product/Aluminum_Shrouded_Hi-Output_Radiator_Fan/Bronco_Cooling_Fans
 

Broncobowsher

Contributor
Total hack
Joined
Jun 4, 2002
Messages
33,587
If you look at any functional OEM electric cooling fan they have a full radiator shroud just like a mechanical fan. Because that is how you make any cooling fan cool a radiator.
 

Timmy390

Bronco Guru
Joined
Jan 1, 2011
Messages
5,282
Loc.
Conway, AR
If you look at any functional OEM electric cooling fan they have a full radiator shroud just like a mechanical fan. Because that is how you make any cooling fan cool a radiator.
Yes....All of the OEM's I've seen have a shroud the fan mounts into. The fan is not directly mounted on the radiator. Most aftermarket (including the Derale I run) mount directly to the radiator and are in contact with the radiator.

The OEM style integrated fan and shroud pulls air across the whole radiator where as the direct mount aftermarkets only pull air over the arear in contact. The 17 inch Derale covers most of my radiator.....

Tim
 

pcf_mark

Bronco Guru
Joined
Jun 11, 2010
Messages
3,451
What is your engine? I’m running stock (except .040 over) 351W, 2 core(1.25”tubes), aluminum radiator. Idling in traffic on hot summer days hits over 210 degrees then I rev up rpm’s to cool it off. Not good!
5.0 HO stone stock. 185 t-stat. Explorer fan tucked inside stock Bronco shroud. Sits at 185 all day.
 

56f100bbw

Contributor
Bronco Guru
Joined
Feb 3, 2008
Messages
2,004
Loc.
Tucson / lakeside AZ
Explorer serpentine fan clutch severe duty installed one today it moves a ton of air I love it 4 seasons pt # 46049 off a chevy trailblazer viprtwolf1 gave me the info thank him plus not noisy
 
Last edited:

73azbronco

Bronco Guru
Joined
Nov 11, 2007
Messages
7,154
Explorer serpentine fan clutch severe duty installed one today it moves a ton of air I love it 4 seasons pt # 46049 viprtwolf1 gave me the info thank him plus not noisy
This^^, there is a plastic fan, but thats the soccer mom explorer, the heavy duty is the v8 one and the towing one.
 

RODRIG3911

Contributor
Sr. Member
Joined
Jul 9, 2007
Messages
945
Loc.
Tucson
NOTHING is better then the explorer mechanical fan with clutch. Plus it gets you a 4G alternator, serpentine and more room... I've tried a 2 speed electric fan from WH with Volvo Controller, didn't work good enough in my desert climate (Sonoran desert in AZ). Also, WH full circle shroud was a HUGE help
 
Top