PWM cooling fan(s) control using ECM

[flyingv]

Update

When I commanded the fan on in the VCM scanner, the fan would come on and ramp up as I increased the percentage. However, when I would lower the percentage the fan would stop, and not restart until I cycled the ignition off/on.

So I went back into the calibration and switched the hz setting to 100 on a chance.

Now the fan runs perfect. Moving up or down on the fan control works like it should in scanner.

Thanks again to everyone in this thread for all the informative posts!


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[andrewb70]

Originally Posted by flyingv

Update

When I commanded the fan on in the VCM scanner, the fan would come on and ramp up as I increased the percentage. However, when I would lower the percentage the fan would stop, and not restart until I cycled the ignition off/on.

So I went back into the calibration and switched the hz setting to 100 on a chance.

Now the fan runs perfect. Moving up or down on the fan control works like it should in scanner.

Thanks again to everyone in this thread for all the informative posts!


Sent from my SM-S906U using Tapatalk

Everywhere I read indicates that the modern brushless fans use 100Hz.

Andrew

[*rayman*]

where's the best place to buy 2 x SPAL VA89-ABL320P/N-94A fans now. Seems to be very few places to purchase from.

Also noticing the same part number coming up on alibaba now, look identical without the silk screened SPAL logo. Anyone tried these?

[flyingv]

I used Hptuners to do the OS swap. I do have the AC pressure sensor wired. I don't see why it wouldn't work without it.

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[samckitt]

Originally Posted by flyingv

I used Hptuners to do the OS swap. I do have the AC pressure sensor wired. I don't see why it wouldn't work without it.

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Where did you get the ZR1 OS file? Thanks

[andrewb70]

With my urging, one of my tuning customers installed a C7 Corvette fan in his 408 Windsor powered Ford F150 with the Holley Dominator ECU.

This fan works flawlessly with the Holley Dominator, which means it will work perfectly with all other Holley systems (excluding Sniper). Fan control was integrated with the AC system trinary switch, which enables different fan speed settings regardless of engine temperature.

He had his truck idling with the AC on in 95 degree AZ heat and the temperature never went above 186, with the fan hovering around 50-55% duty cycle.

Andrew

[dontlifttoshift]

Derp. That's a pretty easy way to do it. 12v from trinary = fan runs at XX%

Well done.

And yeah, just did a C7 fan with a Terminator in a 55 Pickup and its awesome.

[andrewb70]

Originally Posted by dontlifttoshift

Derp. That's a pretty easy way to do it. 12v from trinary = fan runs at XX%

Well done.

And yeah, just did a C7 fan with a Terminator in a 55 Pickup and its awesome.

Donny,

Give me a call when you get a chance. I think you have my number. If not, check your PM.

Andrew

[130fe]

Andrew, do you think the C7 fan would work well with the LS3 GMPP fan wire (without PWM)? I was the one that asked you questions about the C7 fan dimensions on IG yesterday. I currently have the Entropy radiator (and it’s controller) am looking at other radiator/fan options.

[andrewb70]

Originally Posted by 130fe

Andrew, do you think the C7 fan would work well with the LS3 GMPP fan wire (without PWM)? I was the one that asked you questions about the C7 fan dimensions on IG yesterday. I currently have the Entropy radiator (and it’s controller) am looking at other radiator/fan options.

Chris,

The fan wire on the GMPP harness is just a ground trigger for a relay, and will definitely not work with the C7 fan. Spal does offer tidy little controllers for their brushless fans, which I'm certain will work with the C7 fan. However, they are not adjustable, and you have to make sure to pick the right one for your thermostat, otherwise the fan will run all the time. It's definitely not as elegant as what I did on Sean's truck.

Andrew