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Old 07-12-2019, 01:53 PM   #1
bigmoe
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One fan? Two fans?

Planning ahead at this stage with my truck in the paint shop for a while. My swap (65 C10) is using an 08 5.3 + 4L60e in it's stock configuration, and no A/C.
I see the ECU has wires for high speed fan and low speed fan.
I'm wondering if I should use one large fan (2 speed??) or two smaller fans with the second one coming on at the higher temp.?
Which is easier to wire? (think the simpler the better, lol.)
I should let my harness guy know how I'm setting it up so he can make a proper fuse/relay set up.
I should have room for two 10" or one 16" fan.
Anyone have a fan brand recommendation?
What about programming the temps (Brenden at LT1swap.com will program in different temps).

Last edited by bigmoe; 07-12-2019 at 01:58 PM. Reason: clarity
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Old 07-12-2019, 02:13 PM   #2
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Re: One fan? Two fans?

I used two on mine, 12 inch if I remember right, but Im on a 72. I like having two because you have some redundancy. Although if its hot enough and your stuck in traffic you might need both to maintain, but atleast you have a fighting chance if one were to fail.

I also have an 08 5.3, the first fan is set pretty good I think, the second I think needs to be set lower from stock. On mine stock turn on for the second fan was 230 I think. I think I put it down to 220 or thereabouts.

As far as brand I used SPAL, and I think that seems to be the go to brand from what I could tell.
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Old 07-12-2019, 02:37 PM   #3
mongocanfly
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Re: One fan? Two fans?

I've got dual fans on my C30...one comes on at 175 and 2nd comes on at 185...dual fans cover the radiator very well...only complaint I have is fan noise...they are straight blade fans wish I had used curved blade...

On the IH I'm using single spal fan with large dia and curved blades...mostly due to radiator size and factory shroud ...
You can run the factory mech fan if it'll work for you
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Old 07-12-2019, 04:20 PM   #4
MDPotter
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Re: One fan? Two fans?

I would recommend two fans. One to come on at the lower temp, and the other at higher temp. The second one is typically used as the A/C fan as well - if you use a standalone system such as Vintage Air, that system can be tied into the fan with a relay to control it to keep the condenser happy.

As far as temps go, I don't see an issue with the factory settings. I don't know enough about these engines to know how changing the temp settings will affect it, I figure if GM set the temps then that's what's best for them but that could change given any modifications you make or your climate.

You can't go wrong with Spal. My dad's 64 has a 2012 5.3 with a 6L80 and a Dewitts radiator with dual Spal fans and it works great. They are loud, but they will keep it cool. Check out Entropy radiators - they look better than Dewitts in my opinion and they're about the same cost.
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Old 07-12-2019, 07:49 PM   #5
bigmoe
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Re: One fan? Two fans?

Thanks guys. I see Spal has several models of 10” fans. I’ll have to do more research to pick a pair. Maybe the second fan could be a higher cfm. I’ll have to watch the amp rating not to exceed my relays.
Hey I just realized that fan low and fan high actually refer to activation temperature, not fan speed.
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Old 07-12-2019, 08:05 PM   #6
Clyde65
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Re: One fan? Two fans?

Remember some fans are noises as heck! I have two, one comes on at 185, the other comes on with aC or 200
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Old 07-12-2019, 10:41 PM   #7
ls1nova71
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Re: One fan? Two fans?

If you wire 2 fans like the factory did using the 3 relay set up, they will both come on low at first then high if needed. This way you're pulling air from across the whole radiator core rather than just one side. The fans will draw less amps and be quieter when on low this way too.
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Old 07-13-2019, 08:02 AM   #8
bigmoe
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Re: One fan? Two fans?

Quote:
Originally Posted by ls1nova71 View Post
If you wire 2 fans like the factory did using the 3 relay set up, they will both come on low at first then high if needed. This way you're pulling air from across the whole radiator core rather than just one side. The fans will draw less amps and be quieter when on low this way too.
Got a wiring diagram for that way?
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Old 07-13-2019, 12:14 PM   #9
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Re: One fan? Two fans?

http://944hybrids.forumotion.com/t12...iring-question

https://www.67-72chevytrucks.com/vbo...d.php?t=617142
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Old 07-13-2019, 03:16 PM   #10
bigmoe
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Re: One fan? Two fans?

Perfect. Thanks.
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