Flex-a-liteAdjustable Temperature Electric Fan Controller (31149 / 108504)

I wanted to like this module. After a failed Hayden relay/module unit cost me some stress due to overheating, I was looking for the "end-all" fan controller. I ordered this one from Amazon and haven't had it long enough to provide a worthy review. This review is preliminary so ignore it if your concern is for longevity.I was hoping for a solid state module, (without mechanical relays). According to the Flex-a-lite technical representative, "It is not". This means it has an internal relay of a sort, but if it fails - you must replace the entire module. The former Hayden unit this unit replaced had the generic plug-in automotive replaceable relay in it - (unfortunately, it was the control board that went bad on mine).But there are still a number of things to "like" on this unit. All connections are made via plugging in of crimp-on type spade connectors, which are provided - along with a healthy supply of the correct gauge wires for hook-up and a clear definition as to its power-handling capability. I like this wiring connector (or modular) approach compared to the potted hard-wired setup of the Hayden unit. But it was my phone call with the Flex-a-lite tech support that turned me off.I was wanting to know what voltage levels their control relay is designed for. I am specifically concerned with the AC over-ride signal. I am not fond of using the compressor clutch signal for this control since that would mean the fan is cycling on/off with the compressor - and therefore having less time to cool, (than say if it was connected to the signal that is generated by the "AC On" switch). But when I asked the tech rep about the coil voltages, he said he didn't know any of that information. Moreover, he could not forward me to anyone who did. To me, Technical should mean more than just "how to hook it up". The instructions tell you that. I am left to find out by testing it myself.So this isn't a show-stopper but it is a disappointment. This unit cost nearly twice the price of the former Hayden unit but "functionally" it offers very little more, if anything at all. Furthermore, without knowing "what is inside it", the genuine quality cannot be assessed accurately since it must be rendered to be just another "black box".After I have tested/used the unit i may edit/update this review. But for now I have mixed feelings as to its superior fitment.

I had a professional mechanic install this product into my CJ. The capability added with this product in addition to the manual cut-out switch (also available from Flex-a-lite) allows me to manually control the cooling fan so that I can cut it off if I am about to go into deep water or I can manually keep it on when crawling on a hot day. I can also leave the switch in auto position, which allows the vehicle to operate normally without any driver intervention.

I installed this temperature controller and a Flex-a-lite 114 fan on my 94 GMC Sonoma with a 4.3 V6 that had a viscous fan that made lots of noise and took considerable power to run it. The kit contained everything I needed for the installation. The instructions were very good. The biggest challenge was finding the best places to mount the controller and to connect to ignition switched power and A/C-on signal. I mounted the controller on the side of the cold air intake duct near the radiator and found convenient places to connect the wires so they could be routed neatly. Every thing worked exactly as it was supposed to. I set the turn-on temperature of the fan at about 210 degrees so the fan rarely runs unless the truck is stopped at a traffic light for several minutes. So far it appears that the gas mileage of the truck has improved by 3-4 miles per gallon as a result of this installation. I'll give an update after a few more tanks of gas.

I installed this controller last night and it works wonderfully with one exception. When the fan is off, the controller emits what I would describe as a beeeeeeeeeep. You can feel it vibrating so I think the beep is a chattering relay. Ordered another, will send this one back. I agree with other reviews about the quality of the included wiring, etc. It is great quality, the controller itself is of questionable quality.Since I was in a hurry, I ordered a 2nd one then returned the first one, hassle free, to Amazon as DOA. The 2nd one works great.

I love this controller. Does everything I want it to and was easy to wire up. Its not preassembled so you can customize it to your vehicles needs. Everything is high quality in this kit, you will need some extra zip ties though (I did). The only part that I don't really care for too much is the temperature probe. You have to squeeze it in between the radiator fins and then its a hard wire into the control box, I wish it were something else like a low profile probe that could be stuck inside of a radiator hose, with a flexible wire back to the control box. No biggie though it works well, just a preference. If you opt to use the manual control switch from flex a lite be aware that you need to wire it according to the instructions that come with this control box and not the instructions that come with the manual switch, it will blow the control box (Learned the hard way). If anybody from flex a lite is reading this please fix this error or place a warning or something.

Would have given five stars but something happened with the shipping and I got it three days late despite paying extra for expedited shipping. Used for temp probe function on a Flex A Light pusher fan and it works great.

Purchased this one as a back up. My original one that I purchased is 8 years old and is still running fine. Noticed that they have made a few changes in design namely the thermal tube and conduit is located on the right side (much easier to position) and the temp control is much tighter in the setting of it. I converted my wifes S-10 87 blazer to electric fan 8 years ago when I put a new engine in it. I know there is alot of different controllers out there some cheap and some expensive but if you are going to use a thermal bulb control unit this is the best I have found. Have several friends running this setup on all different types of vehicles. The only thing I have found is when installing the unit try to locate it in a spot that will insure for the most part a clean atmosphere.

flawless, cheap and real fast ship

I PUT THIS IN A FRONTIER NP300 DIESEL 2016 Cause the original fan clutch is so bad, heavy and ineficient so far no problem with flex a lite great product

Product came pretty much incomplete. The fuse cable wasnt included when it should be in the box. Fortunatelly I had some other parts laying around in order to make it work. Quality is pretty low, I would buy something else next time for the price paid.