Join Date: Jul 2009
Location: Anaheim Hills, CA
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5.7 AEV - HEMI: Fan Controller Installed
For you guys that have installed the AEV 5.7 Hemi and don't enjoy the radiator fan running 100% all the time, I wanted to share my latest install:
Spal Programmable Fan Controller (FAN-PWM) - Version 3
I bought this fan controller off the 'bay for a little over $100. It wires into the factory water temp sender, the +12v side of the A/C clutch, and a keyed power source. It also grabs power directly from the battery and outputs a PCM signal to the factory fan to control how fast it turns.
It works and it works with the factory sender!
The controller is programmable: you set a low and high temp. The fan comes on at 50% when the low temp is reached and ramps up to 100% by the time the high temp is reached. I set the low temp to the setting where the temp gauge is right in the middle (which appears to be the water thermostat setting--my engine never runs any cooler than this). After unplugging the fan, I idled the engine a little past the mid point on the temp gauge (maybe just beyond 5/8 ths) and set that as the high temp point.
Today was the first day that I went through a fast-food drive through window for breakfast and the fan wasn't running 100%--the person on the other side of the intercom actually heard me just fine!
It's a lot quieter without the fan running full blast all the time, and it's got to be better for the alternator and battery (not to mention a slight savings in fuel consumption--that fan sucks some serious amps at 100%).
If anyone is interested in where to splice into the wiring harness, let me know and I'll dig out the exact wires I tapped--that was the hardest part of this--just figuring out which wires had what signals. It's not hard, but it took some snooping and probing and probably took about a 1/3rd of the overall installation time. Knowing which wires would probably make this about an hour's job.
The unit itself is small and fits nicely in the front part of the air-intake / battery tray. It turned out to be a clean install.
2007 JKU (ex)Rubicon w/bolt-ons: LS3 / 6L80E Synergy Long Arm 4.5" Lift 40"s Dana 60s PSC Hydro etc.