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Originally Posted by BigDave
I bought a dual fan set-up from JEGS for my 402 BB and it uses a bulb sensor temp relay. I have a factory 4-bar radiator. Sometimes when I'm moving in slow, heavy traffic I notice they come on. However, even in the hot, humid, summer months of East Texas, they never come on when I'm moving at a descent speed, usually never comming on above 30-35 MPH.
The best thing I like about them is I have them set to run even after I shut the engine down. Depending on the day they may cycle twice after the truck is sitting. They do a good job of cooling that old big block down. I can also adjust the temp for the season in case I need my heater core to come alive faster when it's cold outside.
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What kinda cash did this little modification run? I like the idea of not running the belt driven fan all the time, that's gotta be at least a couple horsepower lost to that belt, and efficiency saves gas!