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Street Race Truck More... The Toolbox

Electric Radiator Cooling Fan Guide

9/19/2016

There are several factors to take into account when selecting an electric fan for your project. We decided that rather than hunt for all the different variables, we would do the work and have the majority of the questions answered for you.

Tug Of War

First, which is better; Pusher-style fans or puller fans? To answer this, it seems like the consensus is in favor of the pull style fans. Independent tests have shown that even with a pusher style fan mounted only 5/8 of an inch away from the face of the radiator, there is still a vast amount of air that escapes from around the skirt between the radiator and the fan blades. Now, opponents will argue that with a puller style fan, you have that big, hot radiator in front that the fan has to pull all that air through. That’s a logical argument, and in response, there is a reason that most of the classic cars of the day had puller style fans. They work.

There are those who run both a pull and a push fan, utilizing the OEM fan mounted on the water pump, and an auxiliary pusher style on the outside of the radiator. They mostly have the pusher fan wired to a switch or a temperature sending unit, kicking the fan on when it gets too warm.

Is two better than one?

Second, with regards to electric fans, is it better to run a single fan or a dual setup? One thought is that with a dual fan setup, if one dies on you at least you have one to limp home on. A dual fan system from Speedway Motors can fit a variety of applications, and flow up to 2.400 cfm. At just under 3 inches thick, they are ideal for tight space applications, or if you want to do away with your mechanical fan altogether.

Since you are thinking about electric fans anyway, we can’t forget to discuss the wiring side of things as well. We know; we don’t like it either. That’s why the nice folks at SPAL put together an easy to use kit with everything you need to wire in your fans. The kit shown comes complete with harness, relay, fuse holder and coolant temp sensor. Two temperature settings are available for you to choose from. It even comes with instructions, not that we’ll use them.

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