Derale 16720 Electric Fan Controller: Efficient 180°F Single Stage, in Sleek Black Design Review

Starting with the adjustable derale and the tedious recalibration of the thermostat, this fixed rate switch trips at the very exact same temperature every time.

It's a hassle to work with if you're not using the thermostat they provided you with. I connected it to my factory thermostat and had to connect ground to the thermostat. Otherwise, the engine will constantly turn on or off. Very good thick wires and relays.

If I could give it a zero I would. I have received this kit twice once as a replacement. Both kits were missing the main part of the "thermostat switch", it can be seen in the photo and description, shown on the box and listed in the document in the "includes" section. But there is no thermostat switch.

As expected! The wiring is very simple, most of the wiring has been hidden and I feel confident in this kit. I connected a brass fitting to the motor's water connection and it controls the fan itself. You no longer have to wonder if the pin is connected to the heatsink, the motor stops running for 2 seconds after the key is turned off as that Relay controls the power supply.

Chose this for my 67 GTO with an extra electric fan. It seems to turn on about 10 degrees later than advertised, but it works. It looks a little out of place on the front header, but there's not much I can do about it other than find a header with a plug in the back (which I didn't). no) Installation was easy and it doesn't drip. Would buy it again - 1 star because it turns on a bit late

I bought this under the impression of the picture that it comes with fuse holder and fuse along with everything else. It does not come with a fuse holder which can be clearly seen in the pictures. I know it's not that hard to find a fusible link but that's the principle of it all and an additional cost on my part, the fuse holder is clearly visible in the pictures so it would have come with my wired relay setup must.

This is the one to buy - the other from Derale which has a radiator probe that goes into the ribs isn't as good. Buy this one because you can thread it straight into the water channel and get a direct reading. Has been working great for a few months now and will definitely buy again. I'm using it with a non-Derale fan, so no problem there either. The maximum fan current is 25A, which should be enough for most 16" fans.

I bought this to use with the Hayden Automotive 3700 Rapid-Cool Thin-Line Electric Fan, above that I wrote before. This thermostat is a bit more complicated. do not install one where the probe is simply plugged into the radiator fins. None of the included thermal switch adapters fit the existing holes in the heatsink, so we just drilled a small hole in the plastic plug and used the sensor itself to tap the threads. That works great. The fan turns on and off as the coolant reaches normal…