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I'm using a taurus fan and have used a Spal controller for it that uses PWM to control soft starts and ramp up and down speed with temperature.
Real easy on electrical system.
The taurus fan WILL draw 100 amps on start up/inrush.
I saw the volvo fan after I bought the taurus fan and like the flaps in it as it will let more air through while at speed.
I'm retro fitting these to my fan. The taurus fan covers the whole core on my nova.
SPAL also offers a dual 11" fully shrouded with the pass-through flaps across the top and bottom. These also help to minimize how often and how fast the fans run with the PWM variable speed controllers. Not as inexpensive as the junkyard though....
You guys are seriously overthinking fan controllers.
Have a Taurus fan on a carb'd motor controlled by a $40 derale controller with temp probe JB Welded into the radiator fins. Only hooked up the low speed setting, the car runs cool without the high speed. The 85 amp denso alternator seems to handle the load just fine.
And it's not like I'm afraid of PWM controllers, they have their place. I'm in the process of hooking a $20 chinee made ebay PWM controller to my oversized fuel pump to reduce the pump noise at idle. Might even hook an ebay pressure sensor to an arduino and program that to control the modulator. Serious overkill but might be a fun project to build from scratch.
IMO all that is needed is a relay and a mechanical temp switch. KISS. That way if something goes wrong out in the middle of nowhere you can jumper the switch and get the car home. If I had a stock PCM than using those outputs to actuate a relay is all that is needed.
I bought a painless Pwm fan controller. It was pricey, but works really well. I have a derale dual fan set up (4000cfm) and never hear it. It soft starts 1 fan at a time , then ramps up and down according to temp. It also shuts them off at what ever speed you choose.
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