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Old 08-29-2006, 04:55 PM
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Electric cooling fan

I installed a Flex-a-light Black Magic electric cooling fan in my truck. This fan has an adjustable setting on the control box that allows you to dial in the temp. in which you want it to come on at. Additionally, there is a probe that is installed through the cooling fins in the radiator and that is connected to the control box. Once I start my truck it takes about 5-7 minutes before the fan gets hot enough to turn on.(approx. 170 degrees on the gauge). Once on, the fan never turns off while at idle. The temp on the gauge will drop to about 160 while the fan is running at idle. I have not driven the truck since installing the fan so I do not know if they will turn off while driving at speed. The setting on the fan control box is set at the highest temp. to turn on at.
My questions are these: Do these temperatures seem too low? Will constant running of the fans (i.e. they never turn off) do any harm to the fan motor? Will moving the probe to a different location through the radiator have any effect (it is currently positioned about two inches below the upper radiator hose)?

F.Y.I. The engine is a Ford 302. I am running a 100 amp alternator with a red top Optima Battery. I am unable to run a mechanical fan because the engines sits too low in relation to the radiator support. If I do put a mechanical fan on about 35-40% of the fan blade sits below the bottom of the radiator. With the mechanical fan I saw temps of 200 degrees at idle.

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Old 08-29-2006, 09:27 PM
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Hey i installed a flex-a-lite fan in my tempest simply to keep the radiator cooler the problem i have was that the model i got was dual fans and it was actually the thinest model only about 2inches or so, but i couldnt mount it so it would "pull" the air through the radiator. Ive been told thats a better place why i dont know i figure if it's a "pusher" it would work better being it pushes colder air outside the engine compartment into the radiator and especially if the car is in motion because then air is coming right at it. ANYWAY i installed that controll box you speak of, just like it said, and i dont know if it needed another part or it was broken because it never turned on the fan at all. Well i hooked it up to the fuse block so it would come on when i turn on the car and i notice it seemed to work better (for me anyway) because as the car was ideling it would be at it's lowest speed, or at least i think it operates at its lowest speed because as i rev the engine to higher rpms eventually to about 5200 or so you can hear a considerably different sound in the fan and motors, also the amount of air it was pushing through the radiator. Now the only draw back i have is that the module i have is sopossed to keep the fans running 30 seconds after the engine stops, so i dont have that option. Ethier way i figured that would be better for the car anyway because with the air flow it pushes through it helps more air to be pushed around in the engine compartment by the mechanical fan. It also comes on instantly when i start the car, and the fans work more when im at higher rpms so i at least know the fans are ALWAYS working not just when it says "hey the engine is too hot" plus i dont like computers controlling me or my equipment ethier DONT TRUST UM. And finally the fan only draws 17 amps from my battery and i also have a 100 amp alternator, with hardly any accessory's running to draw from the battery. Hope this gave you a second option in stead of sitting at home looking at the car, i know id rather be driving my car.

Last edited by WHIPPININMY68; 09-01-2006 at 08:08 PM.
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