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Thread: Wiring an Electric Cooling Fan - Holley EFI

  1. #111
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    Nov 2014
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    If you're spending the time to rewire your fan, I would go PWM. The C6 Corvette module works great. But you can also use the module from a Ford Fusion. I have them both. They are the same module. I got the complete Ford Fusion rad fan assemble from an auto wreckers for $50. That way I got all the wiring & plugs. The engine temp is a lot more constant, even on a hot day with the A/C on the engine temp only goes up by about 3°F and the DC doesn't go much past 60%. I can't remember the year Fusion, but it's in one of the threads about PWM radiator fan control. I'm not positive, but I think the years are '06 to '09 Ford Fusion.
    Last edited by 81 TransAm; 10-15-2017 at 10:41 AM.

  2. #112

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    Ford Fusion. The Crown Victorias also used PWM fans, but the controller is different. I'd be curious to try it. Andrew

  3. #113
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    Dec 2009
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    Quote Originally Posted by 81 TransAm View Post
    If you're spending the time to rewire your fan...
    He's not rewiring his fan, he just needs to change one end of one wire.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  4. #114

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    Anyone knows the max AMP rating of the those controllers (ACDelco C6 & Ford Fusion)?
    I bought two Derale 14" fans with each 23 amps and would like to run it with a PWM controller.

  5. #115

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    The C6 Corvette fan is rated at 400 watts, which works out to about 32 amps. People have used dual controllers before with great success. You can split the PWM signal wire from the Holley. Andrew

  6. #116

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    Wiring up the additional things I need such as the IAC, VSS, and finally the PWM for my cooling fan, using the same parts as Andrewb70 did. I am, however, having a problem with pin B3. It shows it can work as a G, no other option like P− to select, which is what I need. Pin B10 shows P− as an option, and I've used that for the IAC motor ground, as the Mass-Flo EFI throttle body uses a Ford 5.0L IAC motor. How can I change this?

  7. #117
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    Dec 2009
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    Quote Originally Posted by jeff@califon View Post
    I am, however, having a problem with pin B3. It shows it can work as a G, no other option like P− to select, which is what I need.
    Did you create this electric fan Output in the Inputs/Outputs ICF? HP ECU? Pin B3 is a "G" & "P−" Output Type. (Andrewb70 posted a complete tech video on this.)
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  8. #118
    Join Date
    Sep 2017
    Location
    Bakersfield, CA
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    11

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    I thought I would share my relay wiring diagram that I created. It may be useful for anyone trying to wire up a single dual speed fan & A/C. Note that when the ECU is calling for High speed fan, the power is routed only through the 75 amp relay. Feel free to improve upon this if needed, it's basically just a rough sketch I drew up to follow while I was wiring up my accessories.

    1995 Mustang: 347 stroker, Ford Motorsport block, Probe Industries rotating assembly & main girdle, I-beam rods & forged aluminum pistons, 8.5:1 compression, Trick Flow Twisted Wedge heads, Track Heat intake, Comp Cams NX282HR-14, FMS 1.6 rockers with ARP pushrods, Accufab 70 mm throttle body, 4R70W transmission. Baumannator TCS.
    Current project: Holley HP EFI with DeatschWerks 50 lb/hr injectors, FAST Dual Sync Distributor, DIS conversion with MSD Street Fire coils.

  9. #119

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    Quote Originally Posted by Mikeg View Post
    I thought I would share my relay wiring diagram that I created. It may be useful for anyone trying to wire up a single dual speed fan & A/C. Note that when the ECU is calling for High speed fan, the power is routed only through the 75 amp relay. Feel free to improve upon this if needed, it's basically just a rough sketch I drew up to follow while I was wiring up my accessories.
    This is way easier to do with PWM fan control. Yes, you need a PWM controller, but it also eliminates a bunch of relays. Andrew

  10. #120

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    As I near the end of my install I had some questions regarding how to setup my Spal cooling fan to work with the C6 PWM unit. I sent off the following message to Spal asking for the frequency of the unit, below is my initial question.
    Hello, I have a Spal VA18-AP70/LL-86A fan which I will be using to cool my 1966 Mustang. I am in the final processes of installing a Holley HP series fuel injection kit to the car. I came across an interesting twist to customizing the cooling fans control, using both a coolant temp sensor and a VSS to control fan speed and operation using a PWM. I have used an Auto Meter VSS as it is a hall effect sensor, a PWM from the recent Corvettes, the cooling temp sensor is the unit that Holley supplies for their kit.

    Among the many things that are needed to correctly program this is the frequency of the fan motor. I have search on line looking for this to no avail. Hopefully you can help me with this, I copied and pasted the information given for setting this up from the Holley forum and pasted it below.
    Thank you very much for your assistance with this.

    Contact the manufacturer of your electric motor (fuel pump, water pump, cooling fan, etc.) for the recommended frequency.
    Also, be sure your electric pump or fan is capable of pulse width modulation. Not all electric motors are capable of PWM.


    This was the response I received.
    Hello Jeff. The Brushed DC Motor is capable of being controlled with a PWM signal. The minimum switching frequency is 7 kHz. Operating at lower frequencies will cause permanent damage to the motor. It is recommended to verify the output is capable of handling the current draw of the fan. With 13V applied at the fan, the current draw is regularly ~18.5 – 21 amps. (Could be higher/lower depending on actual vehicle applied voltages.)

    Most people don’t have a good experience with PWM control on the brushed fans. Usually the controllers are not well suited to handle our fans, and it is difficult to protect the system/circuit in the event the fan becomes stalled. The brushed motors are a large inductive load, and most controllers are not capable of 7 kHz. while switching the heavy current load of the fans. Typically Spal would recommend using PWM control with our brushless fans, which use a digital PWM signal. Let me know if you have any questions.
    Kind Regards,
    Brent Chuck
    Application Engineer


    I then asked for clarification.
    Brent, from what you have said I am now not sure what I want to do will work. This link will take you to where the discussion about this is going on, they are discussing the frequency of the fan and what the PWM is looking for, if you could look it over and let me know if I will have a problem I would really appreciate it.
    https://forums.holley.com/showthread.php?6569-Wiring-an-Electric-Cooling-Fan-Holley-EFI/page3
    The PWM draws power directly from the battery through an 8 gauge wire, and the power from it to the fan is about 12" in length using a 10 gauge wire, so I should have sufficient amps available.


    He responded with this.
    Jeff. I'm not sure what information you’re wanting me to read, the forum thread is full of misinformation.
    The fans will “run” with frequencies less than 7K, but you run the risk of overheating the motor. The fan is ~20 amp fan. So if your PWM output is capable of 20+ amps and 7+ kHz. frequencies, it should work with the fan. Perhaps you should reach out to Holley and get their thoughts on running a 20 amp fan through one of their outputs. Holley would be able to provide you with a more definitive answer.

    The wiring sounds fine, but what happens to the system if the fan stalls when it’s running at low speeds? Most PWM controllers have a thermal fuse of some sort, or a current sensing circuit that turns the fan off if it stalls. That’s why I wouldn’t recommend using a C6/Fusion PWM module if people don’t fully understand how the system works.
    Kind Regards,
    Brent Chuck
    Application Engineer


    So, will the C6 unit work with my fan given the frequency that it has? It was interesting his mention of this thread being full of misinformation.

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