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anyone use electric fans

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by dbltapp, Aug 23, 2001.

  1. dbltapp

    dbltapp 1/2 ton status

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    anyone use one of these? i am looking at replacing my OEM fan w/ a electric dual fan on my sub and i wanted to know if anyone had any cooling probs. thanx

    89 SUBURBAN, 1/2 TON, 350 TBI,21/2 LIFT W/33'S
     
  2. BurbinOR

    BurbinOR 3/4 ton status

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    I swapped out my stock clutch fan for an IROC electric setup almost a year ago..........and am very happy with it. My setup - 406TPI small block (*supposedly* known for cooling problems [​IMG]), 4 core radiator (now new as of a week ago), IROC fan and shroud, with a temp probe in the radiator (basically skewered through the radiator about 2" below the top of the radiator) that comes on and off with the temp of the motor. Keeps the motor cool all day long........had a good test a few weeks back, sitting in 97* heat on the freeway going 5 mph for almost an hour, never got hot. So I like them, some guys don't, but with soooooooo many cars on the road now with electric fans, I trust it.

    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<a target="_blank" href=http://www.blazzinor.rockcrawler.com>www.blazzinor.rockcrawler.com</a>
     
  3. dyeager535

    dyeager535 1 ton status Premium Member

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    Somebody just posted on another list that the electric fans (at least the one tested) flowed less air than the factory one. The drag lost through a factory fan is going to be minimal compared even to an electric, since the electric takes its power from the alternator. My suggestion would be to not replace it just to do so, you could probably do more worhtwhile things to the truck for the money : )

    Sorry, didn't mean for it to sound like the factory clutch setup took less power than the electric. What I meant to say, besides on a Dyno or track, you aren't going to notice the difference in power that the factory one takes to turn. And if the electrics are less efficient in cooling, what is the point?

    Dorian
    My tech/links page: &lt;a target="_blank" href=http://www.dorianyeager.com/index2.html&gt;http://www.dorianyeager.com/index2.html&lt;/a&gt;
    No anti-theft measures on your truck? No pity when its stolen<P ID="edit"><FONT class="small">Edited by dyeager535 on 08/23/01 02:58 PM.</FONT></P>
     
  4. AZK5

    AZK5 1/2 ton status

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    The mechanical fan takes a lot more horespower to spin then the increased alternator drag from electric fans. My mechanical fan pulls more air then any electrics that I've seen on the market. Electric fans are very dependable and if you have dual fans it's unlikely they will fail together. Even if they fail, most vehicles can drive down the freeway with no fan. In slow traffic you'd have to stop and let the engine cool off. I'd like to put electric fans on the K5 and see how it does.
    CB

    1973 K5, 400TPI,TH350, 203/205, Dana60/Detroit/5.38 front and rear, 4" lift, 38" TSL's on steel wheels
     
  5. DesertDueler

    DesertDueler 1/2 ton status

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    You dont want to run dual fans. They work agaisnt eash other and can cause it to push less air across the radiator. As for electric fans the best one ive come across is from Ford. It comes off the 1990 Ford Thunderbird Super Coupe. It is a single fan with two speeds. I use this one on my Firebird. I live in AZ so I needed the best one I could find. My car has 525 hp and doesn't run over 200 degrees in the middle of the summer sitting in traffic. The fans from ford are about 300 dollars but well worth it. It has abuilt in fan shroud. The only thing you have to do is make mounting brackets and wire it up. If you have any questions e-mail me at modifierperformance@hotmail.com

    86 Jimmy 4"lift 35"MTRs locked front.Other cars 69 Firebird w/525 hp,and 70 GTO <a target="_blank" href=http://www.geocities.com/modifierperformance>MY vehicles</a>
     
  6. white_knight

    white_knight 1/2 ton status

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    I use electric fans.
    Four core rad.
    Two electric ones in the front and one large one in the back of the rad.

    The big block runs nice and cool at about 180 degrees

    <a target="_blank" href=http://www.whiteknight.scriptmania.com/>http://www.whiteknight.scriptma
    nia.com
    </a>
     
  7. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    You have to watch what you are buying though. You can buy an electric fan from AutoZone, and it might have a bad cfm rating compared to your stock fan. My big block overheats in bad traffic with my AutoZone fan and electical temp trigger. Its rated at 2400cfm, and is being used to "pull" the air from inside the engine compartment.

    Just wanted to have one poor experience posted on this string. I would waste a few of my HP to kick my temp problems any day.

    <font color=red>GOT MUD???</font color=red>
    454/TH400/NP205 - 14BFF/D60/w/ 4.10s
    <a target="_blank" href=http://24.10.209.54/bigolk5.htm>http://24.10.209.54/bigolk5.htm</a> [​IMG]
     
  8. muddin4fun

    muddin4fun 3/4 ton status

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    What about when that electric fan motor hits the water?

    It's been lovely, but I have to scream now.

    <a target="_blank" href=http://www.geocities.com/muddin4fun79blazer/>http://www.geocities.com/muddin4fun79blazer/</a>
     
  9. ftn96

    ftn96 1/2 ton status

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    Do it, you'll be glad you did!

    What is and what should never be....
    <a target="_blank" href=http://www.nashvillek5.freeservers.com>www.nashvillek5.freeservers.com</a>
     
  10. ftn96

    ftn96 1/2 ton status

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    Most of the modern fan motors are protected from the water less they are fully submerged. So that is an issue that only he will have to figure out.

    What is and what should never be....
    <a target="_blank" href=http://www.nashvillek5.freeservers.com>www.nashvillek5.freeservers.com</a>
     
  11. Triaged

    Triaged 1/2 ton status

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    Just don't run it if it is submerged and I think it would be fine. You have to worry more about a flex-fan in the water because it can flex foward enough to cut a nice round hole in the radiator.

    '71 Blazer CST w/ a 400sbc, 4" lift, 36" Supper Swampers, and alot of rust
    <a target="_blank" href=http://community.webshots.com/user/triaged>See it Here </a>
     
  12. muddin4fun

    muddin4fun 3/4 ton status

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    then that would mean that more air would get to the coolant [​IMG]!

    It's been lovely, but I have to scream now.

    <a target="_blank" href=http://www.geocities.com/muddin4fun79blazer/>http://www.geocities.com/muddin4fun79blazer/</a>
     
  13. ftn96

    ftn96 1/2 ton status

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    LMAO!!! Lara you kill me[​IMG]

    What is and what should never be....
    <a target="_blank" href=http://www.nashvillek5.freeservers.com>www.nashvillek5.freeservers.com</a>
     
  14. BurbinOR

    BurbinOR 3/4 ton status

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    You put in a switch to shut it off for water crossings............simple [​IMG]..........

    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<a target="_blank" href=http://www.blazzinor.rockcrawler.com>www.blazzinor.rockcrawler.com</a>
     
  15. BurbinOR

    BurbinOR 3/4 ton status

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    I guess I can see your point.........but can anyone post the facts about lower air flow with electrics? My electric fan is from an IROC and does an outstanding job of keeping the temp constant, constantly [​IMG]...........I can shut mine off for water crossings and I have mine wired to continue to run after the motor is shut off to cool down the radiator. Seems there is more value with electric than stock. Just my .02.

    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<a target="_blank" href=http://www.blazzinor.rockcrawler.com>www.blazzinor.rockcrawler.com</a>
     
  16. dyeager535

    dyeager535 1 ton status Premium Member

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    Well, I see from perma Cooler "How much airflow (cfm) do I need to cool my engine?

    A four cylinder engine requires 1600 cfm; a six cylinder engine requires 2,000 cfm, a small V-8 engine requires 3,000 cfm and large V-8 engines require 4500+ cfm."

    Bet most folks here don't have 3,000 on their trucks...BUT anyway, so far, no hard numbers I can find on the factory fans...



    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     
  17. jarheadk5

    jarheadk5 1/2 ton status

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    After reading a million arguments (a few of which actually had facts involved...[​IMG]) all over the Net about electric vs. mechanical fans, I concluded for myself that it all depends on your particular application. Personally, I'm eventually going to go with a dual-electric push-pull setup, thermostatically controlled with manual override switches, shutdown delay timer, A/C relay, all that cr@p. I don't like the sound of my stock mech. fan chewing water, or how out-of-round and out-of-track it looks.

    It's a happy day in Marine Aircraft Group 49... 405 is ALIVE!!
    [​IMG] <font color=green>Semper Maintenance!<font color=black>
     
  18. BobK

    BobK 1/2 ton status

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    Just did the swap a few weeks ago.Click the link to see pic's of the install.Two 14" Perma-Cool mounted to a new 4 core rad.It went into my 1971 Blazer,350(375H/P).I've had no problems with excessive heat.But it's still early and havn't run into "Arizona summer type heat".

    <a target="_blank" href=http://www.imagestation.com/album/?id=4292465889>http://www.imagestation.com/album/?id=4292465889</a>

    <font color=green>BobK<font color=green>
     
  19. dbltapp

    dbltapp 1/2 ton status

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    wow, lotsa info. i wanted to know if it was worth it for the extra HP it might free up, guess i'll have to do some more homework, thax!

    89 SUBURBAN, 1/2 TON, 350 TBI,21/2 LIFT W/33'S
     
  20. Blazer1970

    Blazer1970 1/2 ton status

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    Some of the Chevelle guys have been using Ford Windstar fans.
    <a target="_blank" href=http://www.chevelles.com/forum/Forum9/HTML/006666.html>http://www.chevelles.com/forum/Forum9/HTML/006666.html</a>

    Not sure if they would fit as nice on a truck radiator, or if you could tolerate the Ford parts on your Blazer.

    Tim

    70 Blazer CST 4X4 350 SM465 NP205
    87 Burb 4X4 350
    01 GMC 2500HD 4X4 Duramax/Allison
     

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