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Electric Fan - Push or Pull?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 1986Blazer, Aug 23, 2001.

  1. 1986Blazer

    1986Blazer 1/2 ton status

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    I am looking at the Flex-a-lite electric fans. Some are designed for pushing and some for pulling. Which is best? Their "Black Magic" fan is rated for engines up to 225 with Air Conditioning. What experience has everyone had with these types of fans? Also....is there a better one than Flex-a-lite?



    <a target="_blank" href=http://www.geocities.com/keywestk5/KeyWestK5.html>http://www.geocities.com/keywestk5/KeyWestK5.html</a>
    So I says to him, I said, "get your own monkey."
    1986 K5, 350 GM Crate, 700R4, NP208
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I guess it just depends on which side of the rad you're mounting it too. If you mount on the front side of the rad you would get a pusher, on the engine side of the rad...a puller.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
     
  3. 1986Blazer

    1986Blazer 1/2 ton status

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    Yea...I understand that, I was just wondering which system is better for our type engines?

    <a target="_blank" href=http://www.geocities.com/keywestk5/KeyWestK5.html>http://www.geocities.com/keywestk5/KeyWestK5.html</a>
    So I says to him, I said, "get your own monkey."
    1986 K5, 350 GM Crate, 700R4, NP208
     
  4. HarryH3

    HarryH3 1 ton status Author

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    I've read that the pullers are more efficient than the pushers.

    <font color=black>HarryH3 - '75 K5</font color=black>
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  5. fr8train

    fr8train 1/2 ton status

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    I find that pullers seem to be more effecient. I had to replace the pusher dan on my gf Taurus. I set up a slimline on the rear side of the radiator and now its cooler than before. I did install it on the front side first and found it was cooling ok. The a/c wasnt as cold with it on the front as it was on mounted the back of the radiator. The engine temp. doesnt spike when its sitting in traffic either( could have been due to the old fan motor dying slowly).

    <a target="_blank" href=http://community.webshots.com/user/thatguydrew23>http://community.webshots.com/user/thatguydrew23</a>
     
  6. BurbinOR

    BurbinOR 3/4 ton status

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    I think Burt4x4 has the black magic setup and is very happy with it...........I run a factory stock IROC fan with shroud cooling my 406...........and I love it. Keeps it very cool and stable at the same temp, whether you are in traffic or on the freeway. Wire in a shut off switch for those times you want to shut it off (water crossings) and wire it hot so it keeps running after you shut off the motor to cool down the radiator..........all controlled by a thermostatic switch in the radiator. Good setup..........look on the board, there is another thread going about this right now.

    <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>
     
  7. BurbinOR

    BurbinOR 3/4 ton status

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    Sorry, didn't answer your question. PULLER fan mounted inside the engine compartment sucking cool air through the radiator is how I did mine and most factory setups are like.

    <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>
     
  8. jarheadk5

    jarheadk5 1/2 ton status

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    For radiator cooling purposes, a PULLER is more efficient. Reason: The puller is sucking relatively calm air through the radiator core, and all the air a puller moves has traveled through the rad. core. The pusher is trying to force turbulent air through the rad. core, and ends up having a significant amount of "spillover" air that doesn't make it through the core.
    Also, a pusher fan kinda gets in the way of some of the incoming air when the vehicle is moving, blocking part of the rad. from getting any airflow.

    It's a happy day in Marine Aircraft Group 49... 405 is ALIVE!!
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  9. RGF

    RGF 1/2 ton status

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    I think that the puller set-up is better but keep in mind that you are subjecting the electric motor to hot air, real hot on some rigs with BBs and the motor may not last as long as it would mounted in front of the radiator.
    RGF
     
  10. '73 K5

    '73 K5 1/2 ton status

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    I've read articles about this before...said the puller was the best.

    '73 K5
    Chevy good...Ford bad
     
  11. HispanicPanic

    HispanicPanic 1/2 ton status

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    sorry 86 for jumping in on your post but since were on the subject if i put a puller on can i still keep the flex fan i already have like for insurance on the electric fan cuz thats what i was planning on doing

    <font color=purple>I put the Panic in Hispanic</font color=purple>[​IMG]
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  12. 1986Blazer

    1986Blazer 1/2 ton status

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    BlazzinOR - Is there any way you can send me a basic wiring diagram for the setup you mentioned? I was planning to do this and since you mentioned it I figure it would make my life easier to see a diagram instead of rigging it myself.

    I would also like a master switch to turn it on when ever I want. Granted I will use the thermo switch but sometimes I would like to turn it on just after starting the engine to get the AC working faster.

    <a target="_blank" href=http://www.geocities.com/keywestk5/KeyWestK5.html>http://www.geocities.com/keywestk5/KeyWestK5.html</a>
    So I says to him, I said, "get your own monkey."
    1986 K5, 350 GM Crate, 700R4, NP208
     
  13. newyorkin

    newyorkin 1 ton status

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    I just installed and wired in a pusher (reversed '92 buick small fan mounted in front on drivers side), in addition to my clutch fan, and noticed it running cooler almost immediately after I turned it on. It was pretty good, almost enough to convince me to ditch the clutch fan and go full electric.
    I'd bet a puller would do better, but this was great for me for now.

    Ratch
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  14. RedDwarf

    RedDwarf 1/2 ton status

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    That's not really why pullers are more efficient.
    The real reason is that a puller is helped by atmospheric pressure. It creates a low pressure area into which atmospheric pressure pushes the air.

    Pusher fans must raise pressure above atmoshperic to move air.



    Lift It, Lock It, LIVE IT!!!
     
  15. Storm Trooper

    Storm Trooper 1/2 ton status GMOTM Winner

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    I have both the stock fan setup and dual electric fans in front. My truck use to rely on the elec. ones only but I perfer to only use the elec. ones as a back up. My truck has never over heated but it is nice to have them. I have a switch inside to turn them on and dumped the thermostat. It might not hurt to have two switches inside if you only have them. One to keep them off (water crossing and service - don't want to loose a finger) and one to turn them on when you want. Not to good for spoters though, guys have told me they were looking at the fans instead of the rocks.......doh!

    [​IMG]<font color=red>[/b]"Rid'in HigH in my K5"[​IMG]
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  16. 4x4_76

    4x4_76 1/2 ton status

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    Two switches?Why not use just one that controls the fan relay?

    I'm too lazy to stick shift,that's why I prefer autotranny.
     

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