Flex-a-liteVariable Speed Controller and Relay Kit with Thread-In Temperature Sensor, Fan Controller With Temperature Probe (31163), Black

Installation was straight forward and is easy to setup. The electric fans on my mustang now start much less quieter and so far have only needed the low speed to keep the car cool, will see what happens in the summer.

Bought this to replace an older version. Installed in a Jeep Wrangler YJ. Easy install, well built, does its job.

This item works perfectly. Much better than the probe in the rad fins unit.

I installed an older version of this in my car over 10 years ago.It was still working fine, but I didn't want to risk overheating, so I replaced it.Since I bought my first one the controller has been redesigned and is much improved.(Not that it was crappy before ;-)The fan speed ramps up and down over about a 10 degree range which is nice.It has a "soft" start so as to be easier on the charging system.Very important to me living in the south:It has a controller lead that can be wired to your AC compressor so that the fan comeson when the AC is running. This provides MUCH improved AC performance comparedto my OEM fluid fan clutch. This feature alone made it worth installing for me!Tech. Support is available. It is speedy and knowledgeable.I spoke with AJ about some details of installing this on my "vintage" 1986 vehicle, and he was incredible helpful!All the parts that you will need are included in the kit, and he fuse block included is the most robust I have ever seen! I've had trouble in the past with the crappy fuse holders from the mass-market parts stores...I expect no trouble from this one!

Great purchase..

Works great, super simple and straightforward to install. I didn’t bother with the manual on/off circuits, just the A/C kick-on. Came with several fittings to get the temp sensor installed without having to buy anything extra.I’d was hoping for dual output so that you could have each fan start at different temps or only one kick on with the A/C. But since they start up at only 60% I suppose having both come one simultaneously isn’t so bad.The only thing I wish it had was a better means of setting the temp instead of making it a guessing game - simply putting tick marks around the trim pot or using dip switches instead would have been nice.On another vehicle I installed one that had a digital readout and all kinds of settings and adjustments, but all told it was probably double the price and I never really used those features.