I'm wanting to setup dual Spal Electric Fans on my pickup (it is an '03 GM vehicle with an ECM with two signal wires available)

I'd like to avoid having to use relays since those can blow causing the fans to not work (I'll probably install some sort of manual override for safety) so I was looking at PWM Fan Controller by Derale at PWM Controller : PWM Fan Controller, Push In Probe

I was hoping to use my ECM signal wire(s) in place of the temp sensor stuck in the radiator fins. Is this Derale Fan Controller a good unit?

Does anyone have any suggestions for something similar that has a proven track record of working well?

 

I found what I was looking for at WWW.AUTOCOOLGUY.COM which is a PWM fan controller by Radio Research LTD

I was wrong in thinking my ECM could provide the signal for this unit as far as temp is concerned. I was thinking since the ECM knows the temp, it should be able to provide the signal, but the guy that runs this company says their PWM system requires it's own temp sensor.

The unit is $174.00 but that's cool considering it has soft start technology that prevents high amp start up of the eFans, it has a fail safe feature to run the fans if the unit or the temp sensor fails, and when you turn off the vehicle the fans run for one minute to continue cooling the radiator coolant

I just need to see if my radiator has a port for their 3/8 brass threaded sensor. If not, I'll need to use their inline sensor in my bottom radiator hose which is easy to do.