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  1. #16
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    Quote Originally Posted by amrg View Post
    You kinda shot yourself in the foot with that electric fan. Its okay, it takes alot of reading to figure out that most advertised cfm is just garbage. Anyway, a clutch fan is rated 5 hp at 4K rpms, that equals 3500 watts, you can see now how an 80 watt electric fan is bad?
    Iirc the supermod setup uses twin 250/300 watt fans which is way superior but if you want to do it urself, try a cts v fan. Check my thread I have alot of info on it but in summary its the most extreme oem fan that you can use and many custom builders with extreme cooling needs are using, and it works super nicely with the alphas pcm.

    But afterall, nothing is superior to a clutch fan unless your issues are at idle or just above idle.

    http://www.hummer4x4offroad.com/foru...d.php?p=229142


    Sent from my SM-G960F using Tapatalk
    I tried putting the fan clutch back on but then I stripped the fan clutch nut threads. **BUMMER!**
    I'm having a difficult time threading it onto the water pump.
    I might have to buy a new fan clutch but a new fan clutch is going to cost $100+ thinking I might as well add another $100 and go with a electric fan instead.

    Will the CTS/ATS V fan clear the oem factory 5.3L where the water pump is? Seems like it'll be a tight fit, my Efan I mention on this thread has about the width of a quarter of clearance just barely fits
    Hows your CTS/ATS V fan holding up?
    2008 Hummer H3 Alpha

  2. #17
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    Im still using the truck water pump, only way since the H3 uses a truck spacing accessory bracket so I migrated all that to the LS3 engine. Only reason I went with an electricn fan was that the mechanical fan wont clear the intake tube coming off the throttle body, which sits 4" lower due to the "car" intake on the LS3. The fan+shroud should be 8cms deep (for clearance). I do have the bolt sticking out of the waterpump cut so the face is flat to gain 1" clearance.
    The fan is great, the fact the controller is built into it and its an oem is even better. Its waterproof, doesnt need relays just an 80 amp fuse connected directly to power and needs the control wire pinned to the pcm. You can run it at speeds between 15% to 100% depending on engine temp and ac pressure which means it doesnt have to run more than needed. The pcm also turns it off above 45 mph (at that speed the fan becomes a restriction). Life wise i dont no, the first one i used was from a junkyard and lasted 2 more years. Now Im using a brand new one.
    Keep in mind you will need to fiber glass the shroud abit to seal properly and cut a small area for the radiatorr inlet.
    Fan is loud at full power but not as loud as the 2 spal HO fans i was using earlier, those were brushed fans and pulled 35 amps each! It outcools them too.

    Sent from my SM-G960F using Tapatalk
    06 H3, Birch White, Lux , Cooper AT3 35s, Borla Performance Cat-back, Bilsteins front w/ 1/2" extended stops, Hunner sleeve, Air Doc w/ K&N filter, Oem Roof lights, 55W HID Headlights and 35W Fog lights.

    09 H3 V8, Arctic Silver, LS376/480 Conversion, 3000 stall, Custom E-fans, 37" KM3 tires, XD Rockstar Wheels 17x9, OEM Sliders, 40K External Trans Cooler, Bilstein 5160s front 5100 rear, O.D. Steering Bracket, 2" Body Lift, Custom Exhaust, Custom intake pipe & K&N filter, Custom PCM tune, Pioneer DVD unit, Aurora 40" LED Light Bar, 50 W HID Headlights

  3. #18
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    You made it fit with the LS3 engine so if I cut the waterpump bolt the fan should fit the Alpha V8 correct?
    2008 Hummer H3 Alpha

  4. #19
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    Quote Originally Posted by StandoutAlpha View Post
    You made it fit with the LS3 engine so if I cut the waterpump bolt the fan should fit the Alpha V8 correct?
    Just remove the fan from the water pump pulley and you'll gain a ton of clearance. That's how I have my eFans set up.
    @Gpcalero Instagram photos and videos

    >The Duke H3T Alpha Build Thread<

    '09 Hummer H3T Alpha - "The Duke"

    - LS3 Swap & Built 4L60E
    - Rancho 4" Lift Kit,
    Texas Speed 224/236 Cam 111 LSA Camshaft, ECP 2" Aluminum Radiator, SuperModulation Dual eFans, HID Projector Headlights, 32 Gallon Aux. Gas Tank, "312" Method Race Wheels, Firestone Rear-Axle Airbags, Daystar 1" Body Lift.

    SOLD -- '09 White H3 - "Lil' Sparta"
    - 35" Trail Grapplers, STARR HIDs, LED taillights, Magnaflow Exhaust, Air Doc CAI, Supermodulation TB, Defenderworx Fuel Door



  5. #20
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    You can see the water pump bolt cut here (this was a previous setup that didnt work)


    Sent from my SM-G960F using Tapatalk
    06 H3, Birch White, Lux , Cooper AT3 35s, Borla Performance Cat-back, Bilsteins front w/ 1/2" extended stops, Hunner sleeve, Air Doc w/ K&N filter, Oem Roof lights, 55W HID Headlights and 35W Fog lights.

    09 H3 V8, Arctic Silver, LS376/480 Conversion, 3000 stall, Custom E-fans, 37" KM3 tires, XD Rockstar Wheels 17x9, OEM Sliders, 40K External Trans Cooler, Bilstein 5160s front 5100 rear, O.D. Steering Bracket, 2" Body Lift, Custom Exhaust, Custom intake pipe & K&N filter, Custom PCM tune, Pioneer DVD unit, Aurora 40" LED Light Bar, 50 W HID Headlights

  6. #21
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    Went back to the clutch fan I figure its the easiest and cheapest way to fix this overheating problem in the summer.
    2008 Hummer H3 Alpha

  7. #22
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    Clutch Fan 1 MONTH [UPDATE]

    I put in a NEW HAYDEN 2889 Thermal Severe Duty Clutch Fan and also removed the E-fan I had on. So I'm running the clutch fan alone.

    Temp still reaches up to 235 F degrees and going up with AC on and the car on idle in stopped traffic but goes back down to (195-200) F degrees when starts driving/cars moving.

    I know turning the AC on will make the car run hotter but why does it do that? My other cars never do that. Only the H3 does that and only car that I owned that does that

    I have already replace a NEW****
    -2 row all aluminum radiator
    -180 F degrees thermostat
    -Waterpump
    -Coolant

    All of that and it still read high temps.??? I think this H3 belongs to winter only I'm so done. What do I still need to do to cool down the BEAST??

    Another thing, the FAN SHROUD is not in.. But I feel like that shouldn't be the problem it could be but it shouldn't hurt the cooling process that much right?.....

    What do you all have to say?
    Last edited by StandoutAlpha; 08-17-2021 at 07:45 PM.
    2008 Hummer H3 Alpha

  8. #23
    Street Tire
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    H3 Alpha Cammed Overheating Issue.

    Quote Originally Posted by StandoutAlpha View Post
    Clutch Fan 1 MONTH [UPDATE]

    I put in a NEW HAYDEN 2889 Thermal Severe Duty Clutch Fan and also removed the E-fan I had on. So I'm running the clutch fan alone.

    Temp still reaches up to 235 F degrees and going up with AC on and the car on idle in stopped traffic but goes back down to (195-200) F degrees when starts driving/cars moving.

    I know turning the AC on will make the car run hotter but why does it do that? My other cars never do that. Only the H3 does that and only car that I owned that does that

    I have already replace a NEW****
    -2 row all aluminum radiator
    -180 F degrees thermostat
    -Waterpump
    -Coolant

    All of that and it still read high temps.??? I think this H3 belongs to winter only I'm so done. What do I still need to do to cool down the BEAST??

    Another thing, the FAN SHROUD is not in.. But I feel like that shouldn't be the problem it could be but it shouldn't hurt the cooling process that much right?.....

    What do you all have to say?
    The fan shroud will make the difference either by throwing around hot air or pulling cool air through the radiator.


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    Last edited by EndeavoredH3; 08-17-2021 at 10:23 PM.


    "Hit it with your purse!"

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    StandoutAlpha (08-19-2021)

  10. #24
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    Fan shroud is very importat, as said earlier. Air will pass through the least resistance and having a dual row radiator upfront will make the fan tend to pull more of the air around it instead of suck the air infront of the car through the radiator.

    Sent from my SM-G960F using Tapatalk
    06 H3, Birch White, Lux , Cooper AT3 35s, Borla Performance Cat-back, Bilsteins front w/ 1/2" extended stops, Hunner sleeve, Air Doc w/ K&N filter, Oem Roof lights, 55W HID Headlights and 35W Fog lights.

    09 H3 V8, Arctic Silver, LS376/480 Conversion, 3000 stall, Custom E-fans, 37" KM3 tires, XD Rockstar Wheels 17x9, OEM Sliders, 40K External Trans Cooler, Bilstein 5160s front 5100 rear, O.D. Steering Bracket, 2" Body Lift, Custom Exhaust, Custom intake pipe & K&N filter, Custom PCM tune, Pioneer DVD unit, Aurora 40" LED Light Bar, 50 W HID Headlights

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    StandoutAlpha (08-19-2021)

  12. #25
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    Ill third that. Fan shroud makes HUGE difference for both E fans and mechanical. Get the alpha shroud back installed and it will make a huge difference. Also, this isnt a old GM 350. The LS engines can run hotter with a proper tune and not have any issues. This was done for emissions reasons I have read. In the summer, sitting in traffic with the A/c on 210-220 isnt going to kill the engine. I would think you could get down to that range with the shroud installed.
    Current:

    2006 Red H3 Adventure/ luxury- 37" iroks, HD tierods, steering rack kit, custom front IFS HP Dana 44 diff with Yukon zip locker, Np241 manual T-case, 6.0L VVT/ 6L90 swap

    2008 Black H3 Alpha- HD tierods, steering rack kit, Custom HD lower control arm bushing kit

    2007 Black H3 Luxury- 1.25" bodylift, elocker, 4:1 t-case, steering rack kit, custom front IFS HP Dana 50 diff with truetrac, 37" bfg km2, H3x 18" wheels

    2009 Black H3T base- custom front IFS HP Dana 44 diff with truetrac, 37" centennial trail hogs, H3x 18" wheels

    2008 White H3 Adventure

    2009 White H3 Alpha Cammed 6.0L and 35s

    I think we might have too many of these things now...

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    StandoutAlpha (08-19-2021)

  14. #26
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    I will install the fan shroud back on and go from there and will give an update 1 month from now.
    2008 Hummer H3 Alpha

  15. #27
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    Once all is said and done, if you still have issues maybe the tune needs looking into. Running too lean will get temps up

    Sent from my SM-G960F using Tapatalk
    06 H3, Birch White, Lux , Cooper AT3 35s, Borla Performance Cat-back, Bilsteins front w/ 1/2" extended stops, Hunner sleeve, Air Doc w/ K&N filter, Oem Roof lights, 55W HID Headlights and 35W Fog lights.

    09 H3 V8, Arctic Silver, LS376/480 Conversion, 3000 stall, Custom E-fans, 37" KM3 tires, XD Rockstar Wheels 17x9, OEM Sliders, 40K External Trans Cooler, Bilstein 5160s front 5100 rear, O.D. Steering Bracket, 2" Body Lift, Custom Exhaust, Custom intake pipe & K&N filter, Custom PCM tune, Pioneer DVD unit, Aurora 40" LED Light Bar, 50 W HID Headlights

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    atvspeed4 (08-19-2021)

  17. #28
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    I am also dealing with my ls2 swap running a bit hot. The fan shroud makes a big difference in cooling capability as others have mentioned so hopefully that helps. Are you running a stock induction system? I noticed my intake air and underhood temps just keep rising when I am not moving which also contributes to the coolant temp rising over time. The hood gets too hot to touch. Just make sure you have a good seal to the fender to prevent sucking in hot air into the intake.


    For reference on other gm applications the cooling e fans don't even go into high mode until 235 degrees f and the overheat light doesn't set until over 250 degrees. So if you are running in the 220 range it might not even be considered "overheating" by design.

    Sent from my SM-G960U using Tapatalk


 

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