Hey guys,

Im looking at doing the e-fan swap here soon and i was reading on the how-to
Link: https://www.f150forum.com/f72/my-efa...p-w-pics-7032/

and my question is instead of getting a delphi controller. Couldnt you just use a relay and tap into the Fan clutch connector so when the wire gets power to fire the clutch it fires the relay? Relay then fires and the e-fans turn on? Or is there another reason for the delphi controller on the How to?

thanks

 

I did find this though on jegs which looks like it would work in this situation.

http://www.jegs.com/i/Derale/259/16720/10002/-1?parentProductId=758411

 

Where are you going to thread that thermostat into?
The problem with using a relay setup is that the PCM sends a signal to the fan Clutch (of an undetermined type) which modulates the fan speed based on demand, therefore the signal is variable and not strictly a 12v on-off. The control voltage on a relay usually must remain constant in order to close the switch.
I haven't been able to determine if this signal is PWM or just a varied voltage signal like the crown Vic. I'm convinced an Efan assy from the late model crown Vic will work, as it's variable and comes with a controller built in.

 

I was going to look at my radiator tonight. I thought they had a area where you could drill n tap on the radiator housing. I could be wrong.

You think the Crown Vic assembly will almost be plug n play....

 

The crown Vic controller has 3 wires, 12v hot, grnd, and the speed signal wire from the PCM. At 12v input on this wire, the fan is stopped, as the voltage approaches 4v the fan increases in speed to max speed. The controller is built into the shroud, which is about 90% of the size of an 04-08 radiator.
Like I said though, no one can tell me what kind of signal our PCM produces.