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  1. #31

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    it overheated on a mountain road the other day....
    miles and miles of cruising in 2nd and 3rd gear caused it to boil over at about 240 X(
    so i filled in that 2.5 inch gap radius around the fan with some fabed up sheet metal (ill take pics later) and ill try again.
    clearly it was not drawing enough air through the radiator.
    im thinking that 3,000 CMF may not be enough to cool the engine under steady load for that long....

    now that the seal is tighter hopefully it will now draw the full 3000 cfm through the radiator. but i may have just wasted $140....
    in other news, my gas millage is up my 3mpg to a tank range of over 450 miles
    Gas was $1.83 when Obama took office.....

  2. #32

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    Hopefully that helped. May need a higher CFM fan too. Glad the MPG went up.
    David
    2004 Silverado 2500 Crew Cab 4x4, AMSOIL EA air filter, Granatelli MAF sensor, Throttle body spacer, Magnaflow exhaust (true dual to 2 in 1 out muffler), 6" ProComp lift (add a leaf and 5" superlift rear block), Bilstein shocks, 35's (Cooper Disoverer ST) and 4.10 gears, Rhino Liner, EGRUSA fender Flares and widow visors, extended stainless steel brake lines, firestone airbags w/onboard air compressor, Pioneer Avic X940BT navigation, Accel backup camera.
    http://www.gmtruckclub.com/forum/sho...Silverado-2500
    1960 Land Rover Series II 88
    2001 Pontiac Sunfire
    2013 Toyota Avalon Limited (Wife's Car)
    NRA Life Member

  3. #33

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    Quote Originally Posted by K15 Blazer Guy View Post
    it overheated on a mountain road the other day....
    miles and miles of cruising in 2nd and 3rd gear caused it to boil over at about 240 X(
    so i filled in that 2.5 inch gap radius around the fan with some fabed up sheet metal (ill take pics later) and ill try again.
    clearly it was not drawing enough air through the radiator.
    im thinking that 3,000 CMF may not be enough to cool the engine under steady load for that long....

    now that the seal is tighter hopefully it will now draw the full 3000 cfm through the radiator. but i may have just wasted $140....
    in other news, my gas millage is up my 3mpg to a tank range of over 450 miles
    i guarantee thats plenty of airflow...
    its all about that space between the fan and the radiator, seal it up as best as possible, I had a thread on here a long while back about my engine heating up really fast, and come to find out It was because I had removed my stock mechanical fan "shroud" while I had been measuring over the weekend my my efan install. I decided it wouldnt be a big deal to leave that big hunk of plastic out of the engine bay because what harm would it do??? WRONG! its all about pulling the air THROUGH the radiator, otherwise youll have what i had, which is hot air recirculating under the hood.... I put the plastic shroud back on and my problems went away instantly. of course i Have efans now so no problems, but the LS1 fans literally sit flush up against the radiator, so definitely no flow problems there...

    seal those gaps up and youll be alright
    2000 Chevrolet Silverado

    Powertrain:
    4.3L V6, 4L60E, 2WD, Single Cab
    Performance:
    Airaid CAI
    Poweraid TB Spacer
    Flowmaster 10-series exhaust (dumped)
    BLACKBEAR TUNED!!!
    Edge CS insight monitor
    4.10 gears
    Limited-slip differential
    LS-1 Dual Electric fans
    Corvette tranny servo swap

    Audio:
    Head Unit: Alpine
    Speakers: Alpine SPR-60C 6.5" component set, 4X6 Infinity Kappas
    Subs: 2-12" Kicker CVT's
    Amps: Alpine-M1000 (subs), Alpine MRX-F65 (Speakers)


    Tires/Wheels:
    305/70R16 NITTO Terra Grapplers
    16" PROCOMP 7089's
    Suspension:
    2" leveling kit
    3" Fabtech Spindle Lift Kit
    Front/Rear-Bilstein 5100 shocks

    Lighting:
    FRONT
    35W HID Low Beams
    RECON LED smoked roof cab lights
    REAR
    HELLA LED taillights and 3rd brakelight
    HELLA FF-75 Aux. Reverse Lamps
    RIGID dually D2, flush mount, wide beam
    Accessories:
    Hawk HPS Brake pads
    Russell braided steel brake lines
    Powerstop-red powdercoated brake calipers
    Powerslot Cryo brake rotors
    EGR in-channel window visors

  4. #34

    Default

    I wish I looked closer at the fans you guys said you installed.
    they're all dual set ups that run over 5000 CFM

    so yeah...
    its either buy a second fan, and make my own dual housing/shroud,
    go back to stock,
    or drop $600+ in the set up some of you have
    Last edited by K15 Blazer Guy; 07-09-2013 at 03:16 PM.

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