Kassan1973 Posted July 1, 2020 Report Share Posted July 1, 2020 Hello i have some ford el fans with low and high speed and wanted to know the easiest way to set up low speed relay to turn on at 70 deg and high speed relay at 90 deg , will be switching a earth to fan relays, and then also switch high speed with AC compressor on , im using a G4 extreme which is currently just switching a aux output high speed only with no AC switching. Cheers Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 2, 2020 Report Share Posted July 2, 2020 Set the aux that is connected to the low speed relay to "engine fan" and set your temp (70). Set the 2nd aux that is connected to the high speed relay to "AirCon Fan", and set its temperature (90). This output will turn on whenever the AC is on or if the temp goes above 90. Aux 3 (low speed) & Aux 4 (Hi speed) used for this example: Quote Link to comment Share on other sites More sharing options...
Kassan1973 Posted July 3, 2020 Author Report Share Posted July 3, 2020 cool and to confirm i just need a wire from the AC clutch to a aux input to trigger ECU for AC fan ? Cheers Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 3, 2020 Report Share Posted July 3, 2020 1 hour ago, Kassan1973 said: cool and to confirm i just need a wire from the AC clutch to a aux input to trigger ECU for AC fan ? Cheers Might have to clarify what you want to do here. Do you want the ecu to control the AC clutch, or is that controlled by some other module in the car? Quote Link to comment Share on other sites More sharing options...
Kassan1973 Posted July 5, 2020 Author Report Share Posted July 5, 2020 Hi Adam i need ecu to turn on low speed and high speed fan as you have done for me , and additionally turn on high speed fan when the AC clutch engages , AC is controlled via normal dash heater control ( completely separate unit) i was going to run a 12 volt + or - switch wire from the AC unit to ecu to tell it when the AC is on and then have it switch high speed fans on regardless of temperature. OR I can run a relay off the ac clutch wire and use this to earth high speed fan relay this isnt an issue was just trying to do it through the ECU if possible but again it pretty easy to do via a relay if needed . Cheers Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 5, 2020 Report Share Posted July 5, 2020 You will need to connect an AC signal to a DI and set that as "AC Request". You will also need to assign an output (Aux, fuel or Ign) to "AC Clutch" (this doesnt need to be wired to anything - just the ecu needs to think it is controlling the clutch for the AC fan function to work). Quote Link to comment Share on other sites More sharing options...
neil brown Posted July 5, 2020 Report Share Posted July 5, 2020 I just run 1 output for my both my fans will post set up later Quote Link to comment Share on other sites More sharing options...
Kassan1973 Posted July 5, 2020 Author Report Share Posted July 5, 2020 Thanks Adam sounds good, Neil i like running a low speed as per factory setup as on cooler days engine really doesn't need high speed and just more noise and power drag Cheers Quote Link to comment Share on other sites More sharing options...
neil brown Posted July 5, 2020 Report Share Posted July 5, 2020 Fair enough My car did have air con but used space for other stuff both my fans come on at same time to cool engine seems to be work fine always been like that even when I was on a G1 link ecu Quote Link to comment Share on other sites More sharing options...
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