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Flex-a-lite Blog

  • 3 Easy Ways to Prep Your Car or Truck for Summer Heat

    Comments ON 2018 May 15
    by therealcoleq

    Summer is nearly here, which means it’s time to get out there and have some fun with your hot rod, muscle car, 4x4 or truck! It can also mean overheating or living in fear of overheating if the cooling system isn’t up to the task.

    Fortunately, keeping your customized and hot-rodded vehicle cool isn’t too difficult. Here are three things you can do right now to make sure that you have fun in the summer sun!

    Continue reading

  • Using the Flex-a-lite 1000 Airmover at the Race Track

    Comments ON 2017 March 24
    by therealcoleq

    If you are a racer, you know how critical is to cool your car down quickly between rounds at the race track. You often have only a matter of minutes before it’s time to pull back into the staging lanes. Cooling your intake manifold, supercharger, fuel lines, clutch, transmission and more makes a significant difference in the car’s performance. While we’ve seen everything from clumsy box fans to leaf blowers used as pit fans, the Flex-a-lite 1000 Airmover has the function and features to make it the ideal fan for use at the race track. Continue reading

  • How to Convert a Puller Electric Fan to a Pusher

    Comments ON 2016 July 23
    by therealcoleq


    Many Flex-a-lite electric fans can be reversed, so they can be used as either a pusher fan (an auxiliary fan mounted to the front of the radiator) or a puller fan (primary cooling fan, mounted behind the radiator). The process of reversing them is easy and straight-forward.

    Lift the blade off the shaft (you may have to wiggle it side-to-side while lifting), turn the blade over and insert it back onto the shaft. Re-install the E-clip. Continue reading

  • How to Troubleshoot Issues with a Flex-a-lite Variable Speed Controller (VSC)

    2 Comments 2016 July 4
    by therealcoleq


    With any advanced, multi-feature electronic device, there are opportunities for things to not always work correctly. The Flex-a-lite Variable Speed Controller (VSC) is our most advanced electric fan control module, and it has several features built in. The following video and guide will help you diagnose and troubleshoot issues if your electric fans are not functioning the way you think they should when using the VSC.

    Most of the time, when we get questions from customers regarding the VSC, the problem is a wiring issue. The first thing for you to do when troubleshooting an issue is to check all of the wiring connections at the controller. Double check the routing of the wiring. Look for signs of excessive heat at the connections or frayed wiring. Replacing any wiring that looks suspect. Many of the problems that customers experience are simply caused by not connecting the large black and red wires from the controller directly to the battery. Continue reading

  • The Perfect Fan Shroud Position

    Comments ON 2016 July 4
    by therealcoleq


    If you’re running a belt-driven fan, there are a few things you need to do in order to maximize the engine cooling that the fan can provide. It’s critical that the fan be positioned properly within the fan shroud and that there is just enough clearance around the fan blades. The first thing we want to make sure is that you actually have a fan shroud. If you rely on a belt-driven fan for engine cooling, a fan shroud is a must to pull the air through the radiator. Without a shroud, air will take the path of least resistance, pulling air from over and under the radiator instead of through it. Continue reading

  • How to Install Flex-a-lite’s 3-Way Electric Fan Manual Override Switch

    Comments ON 2014 September 4
    by therealcoleq

    For decades Flex-a-lite has included a terminal on its popular electric fan controllers to allow customers to connect an override switch to either turn the fan(s) off for water crossings in an off-road vehicle or to make ordering in the drive-through a bit easier, or to turn the fan(s) on for additional cooling which is handy for a race car in between runs on the track. This is in addition to the automatic function of the fan controller which turns the fan(s) on and off according to engine coolant temperature. Flex-a-lite recently introduced a new 3-way switch (part number 31143), though that lets you override the fan controller for both manual on and off operation! Additionally, the rocker switch is illuminating, with a red light indicating that you’ve manually turned the fan off, and blue to remind you that you have the fan in manual on position. Continue reading

  • Why We Require the Use of a Flex-a-lite Fan Spacer

    Comments ON 2014 April 3
    by therealcoleq

    Have you ever wondered why we require the use of a Flex-a-lite® spacer with our belt-driven fans? The answer is simple: we saw the damage other brand spacers were causing to the star of the belt-driven fan! We can easily tell when one of our Flex fan or other belt-driven fans has been used with one of these off-brand spacers; it will leave the imprint right in the star. In fact, we won't warranty damage done to one of our fans if another brand spacer is used. Continue reading

  • How Radiator Cap Pressure Affects Cooling

    2 Comments 2013 August 20
    by therealcoleq

    Flex-a-lite-radiator-capOne of the Monday Tech Quizzes that we posted the Flex-a-lite® Facebook page was about radiator caps, and whether or not the pressure of the cap might help solve an overheating problem. As we tried to formulate a short answer for this question, we were reminded of how complicated the topic really is. So we decided a post on our blog would be the best way to provide useful information on the topic.

    First, the radiator cap is an important part of the cooling system. It is designed to hold a certain amount of pressure inside the system, and to release the pressure when it exceeds a pre-determined level. Why do you want pressure in the cooling system? Continue reading

  • Tips for Mounting a Flex-a-lite Fan Controller

    4 Comments 2013 August 6
    by therealcoleq

    Most of the Flex-a-lite electric fans come with either and Adjustable Thermostat Controller our Variable Speed Controller. While we've done a segment on wiring them, one of the common questions we get is where is the best place to mount them?

    There are a couple of things to consider when choosing a location:

    • You will need it to be close enough to the radiator for the temperature probe to reach.
    • You want to keep it away from extremely high heat. Typically, on the radiator support or high and forward on an inner fender panel is good.
    • You will also want to mount it high in the engine bay to keep it away from road debris and excessive water that can splash up as you drive.
    • Finally, they are water resistant, but not waterproof. Do not mount them in a way that allows water to pool up around the terminals.

    Flex-a-lite fan controllers are designed to take the place of relays, and offer you the ability to adjust what temperature the fan or fans turn on at, ranging from approximately 160-240 degrees Fahrenheit. We match the proper controller with our fans to accommodate the amp load, and we provide either a fuse or breaker. If you want information about choosing the right controller for your application, check out this article.

    For more information, visit

  • How to Choose the Right Electric Fan

    1 Comments 2013 April 25
    by therealcoleq

    Replacing a belt-driven fan on your engine with a Flex-a-lite electric fan can be a great way to improve power, fuel economy and even give you a quicker engine warm-up. But how do you choose the right electric fan for your application from the 82 different part numbers on

    The first step is to know what fits. We covered this in an article previously. In this article we're going to spend more time talking about the differences between the various fans that fit your application to help you get the right electric fan. Continue reading

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