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FAN SETTINGS

The Electric cooling fans can be controlled separately. Just a reminder – the system only controls a RELAY. DO NOT CONNECT DIRECTLY TO THE FAN – THE ECU COULD BE DAMAGED, AND DEFINITELY THE FAN WILL NOT WORK. The ECU provides a grounding signal for the control solenoid of the relay, which energizes the relay and allows the battery to supply voltage to the cooling fan.

Fan 1(2) ON Temp = Above this temperature, the electric cooling fan will be turned on.

Fan 1(2) OFF Temp = Below this temperature, the electric cooling fan will be turned off. Make sure to set this temperature below the Fan ON Temp.

Option Fan1(2) Enable = If you are not using an electric cooling fan that is controlled by the FiTech ECU, set this to Disabled. If you are controlling the electric cooling fan with the system, set it to Enabled. Leaving the fan in enabled mode, but without connecting a fan relay will result in a Fan Fault Code, and also some minor RPM fluctuations at idle when the ECU attempts to turn on the cooling fan.

40 comments on “FAN SETTINGS

  1. My car has electric cooling fans controlled by a thermal-couple in the radiator tank. Should this be disabled and use the FiTech logic instead?

    1. The choice on what controls the fans is up to you. We dont require the EFI to control the fans but it is a nice feature that comes with the EFI systems.

  2. I have wired in the relay to allow the FiTech to control my cooling fans, but this vehicle (65 oldsmobile) has factory air and I’d like for the cooling fans to come on when the A/C is activated. Is there an easy way to do this? Will having an A/C override manual on mess with the FiTech?

    1. The Go Street and Power Adder systems can turn on the fan when the AC turns on.

      1. I know the Power Added has an extra harness with place for AC signal but is not in the Go Street. How can I achieve that?

        1. The Go Street uses the black wire on the main harness as the A/C input so that it can turn on electric fans when the A/C is on.

  3. I do not have cooling fans, do I input the setting to disabled?

    1. Yes. Set it to disable and it will stop throwing fan fault codes.

  4. when we turn ignition on fan comes on how do we set it to come on at certain temp .

    1. The system is defaulted to turn the fan on at 174 degrees so if you have the fan turning on at key on you have some sort of wiring issue.

  5. I don’t have an electric fan and have the yellow fan wire capped off but the controller won’t let me disable the fan when I hit the edit button. What else can I try as I keep getting the fan fault code.

    1. Use the joystick to the right of the screen to change it. Highlight the fan enable selection and click right on the joystick to change it.

  6. Three part question! I have a dual electric fan set up in my 71 Camaro. (1) I have a Go EFI 4, and if I’m following my directions correctly, I wire the Yellow fan wire from the EFI to the fan(s) Ground on the fan relay (BLK)? (2) My fan relay has a (YLW) ON/IGN, (ORG) Fan 1 +, (BLUE) Fan 2 +, (RED) POs Batt, (GRN) Clutch, and (BLK) Ground to choose from, just verifying the wire! (3) The fans have an external temp sensor as a control, is this eliminated with the EFI now controlling the fans?

    1. What you have is a fan control module which would have to be bypassed if you want the FiTech system to control the fans. You can also leave the module and shut off the fan option on the EFI.

      1. If I opted to bypass my fan control, so that the EFI can control the fans, is there a dual electric fan relay that FiTech recommends? Is there an advantage for the EFI to control the fans?

        Thanks for your help!

        1. Just use 2 relays and have the FiTech ground both relays. You will only have 1 fan speed however where it sounds like you have 2 right now.

  7. I have dual electric fans I’m hooking the yellow wire to ground two relays to control two fans. If the yellow wire grounds the relays what do I hook to the 86 terminal on my relay? A switched ignition source?

    1. You are correct. Switched ignition.

  8. When i check the ecu output of the fan control wire ( with an LED testlight.) It gives me a constant negative signal. Enabling or disabling, or changing temps makes no difference. …this doesn’t seem right??

    1. You can use a test light to check the fan output wire. The yellow fan wire applies a ground so hook your test light to the wire and the other side to 12 volts. Once the temp is reached the light should light up. Also be sure to check the FAULT CODE section on the Main Menu because if a code was on for the fan the circuit is disabled. Just clear the code.

  9. I was wondering if there is a way to have the fitech control the fans when the engine isn’t running, so I can cool the car between rounds?

    1. No, the ECM needs to see a RPM signal to operate the fans. However you could install a fan override to achieve the same goal

  10. I won’t be using 2 wires, the Black for A/C (don’t have A/C) and the Yellow for fan (I have electric fans that come on/off with a temp sensor), what do I do with these 2 wires? Can I just cut them off?

    1. Unused wires can be cut back and tucked into the harness. Both of these wires are inputs so they will not supply any power.

  11. i am still confused? i am using a 50 amp constant duty relay to run my fan (Ford Taurus) dose the ECM supply 12 volts to turn on the relay at temp? or am i missing something?

    1. The ECU applies a ground to trigger the relay. It is a ground side switch.

  12. I have two Questions; 1. Is the Go EFI capable of grounding 3 fan relays so I can have a relay for each of my 3 fans? I have a short wide radiator with 3 10″ fans and would like to have an off over-ride as well as an on over-ride for each fan. (Its an off-road vehicle) 2. Will it hurt anything on the EFI to have a fan over-ride switch also wired from the ground on the relay to chassis ground?

    Thanks!
    -Frank

    1. The fan wire from the EFI can NOT handle a lot of load. It would be best if you could use one high amp relay to turn all the fans on. You can also run an override if you need to.

  13. How can I test the fan control before cranking? Can I trick the rpm signal to make the fitech operate the relay ?

    1. If you ground the relay where the yellow wire hook up the fan should turn on. If it does you know the efi will work. Just watch the coolant temp on the handheld and when it hits the fan on temp the fans will turn on.

  14. I HAVE 2 FANS BUT ONE RELAY AND WANT TO USE THE MEANSTREET 800HP SYSTEM AND WIRE IT USING THE FITECH ECU WILL IT WORK PROPERLY ON THE SPECS PAGE IT SAYS THE 800HP SYSTEM WILL ONLY RUN ONE FAN AND I WOULD NEED THE 1200HP SYSTEM TO RUN DUAL FANS I BELIEVE I CAN USE THE 800HP WITH THE ONE RELAY PLEASE LET ME KNOW IF THIS IS CORRECT I WANT TO MAKE SURE I ORDER THE CORRECT SYSTEM THANK YOU.

    1. You can turn on 2 fans with the one relay switch.

  15. In the handheld, when trying to adjust the fan temps. My off temp will not adjust correctly. If I set them to 195 off. It saves as 193. I had to set and save as 197 off to get my correct setting of 195 to take. Whats going on here?

    1. These value do round up or down a couple degrees. This is normal.

  16. My fans turn on at start up and stay on. I asked the company I got my radiator and electric fans set up about wiring to the Fitech and they said “I’m not familiar with that setup but the gray wire is the one on our wiring kit that sends a ground signal to the relay to tell the fans to come on.” So that’s where I connected the FiTech wire to.

    1. The way you wrote this it sounds correct. The FiTech (yellow) wire connects to the relay trigger ground. Usually pin 85 on the relay.

  17. Using a meter, I am not reading a ground from the Yellow fan 1 wire with the ignition on and Fan1 enabled in the handheld. Fan off temp is set 10 degrees cooler than the fan on temp. The handheld wont let me edit the “enable” function and I took a voltage reading of the Yellow fan 1 wire and it reads 3.5Vdc with the ignition On.

    1. The system will not work unless the engine is running. Also check fault codes for a fault pertaining to the fan.

  18. I have two fans that I want to run independently of each other. #1 on and off at one temp,#2 on and off at another temp. Both on with AC. Can this be done? If yes, what other wire is used?

    1. Only our Poweradder systems can handle two independent fan on/off temps. If you have one of these systems you will use two relays and the FiTech fan 1/2 wire will ground the trigger side of the relay. If you use the AC wire the system can turn on only 1 electric fan.