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Originally Posted by toddtheodd
So this is the idea. I already have 2 electric fans on my truck. And I really only need them on below 40mph. How would I set something up to turn the fans on when I go below 40 and turn them back off when I go over 40?
I was thinking of using a speed warning with a relay and setting the speed warning for 40. But unfortunately, I don't have the speed warning thingy on my truck.
Any other ideas for how I could accomplish this?
Todd
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If you're trying to do something different for the novelty of it that's cool. However, I don't understand why MPH is the factor and not temp. Temp regulation is the entire purpose of the cooling system and maintenance of a certain operating range is the key, not MPH. If your engine is operating within that acceptable temp range and you are set up so your fan(s) work regardless of the temp just because you're under a pre-set MPH, you are just wasting amps and providing no benefit to the cooling system.
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.