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Hayden Electric Fan Controls 3647

$35.97

Fan Switch, Thermostatic, Radiator Probe, Adjustable 160-210 Degrees F, Kit

Estimated Ship Date: Tomorrow Would you rather pick it up? Select Location

Manufacturer's Part Number: 3647
Summit Racing Part Number: HDA-3647

UPC: 036752036479
Thermal Switch Style: Adjustable fan control kit
Sending Unit Style: Radiator probe
Sending Unit Included: Yes
Fan Quantity: Dual
Adjustment Range (F): 160-210 degrees F
Relay Included: Yes
Wiring Harness Included: Yes
Manual Override Switch Included: No
Air Conditioning Relay Included: Yes
Quantity: Sold as a kit.
In-Store Pickup: Choose In-store pick-up (OH, GA, NV) on our web site.

Make sure that your cooling fans turn off and on with Hayden electric fan control kits. These Hayden automotive electric fan kits are designed to allow your electric fan to turn off and on at certain temperatures. Hayden offers these electric fan kits for single or dual fan applications. All of these Hayden electric fan kits are compatible with their own fans and original equipment cooling fans. They include all necessary wiring, relays, circuit breakers, sending units, hardware for installation, and detailed instructions.

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14 Customer Reviews for Hayden Automotive 3647 - Hayden Electric Fan Controls

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I have 2 of these installed for over 5 years

I have 2 of these installed for over 5 years, on and off road, in my silverado. One fan for low and they other for the high with both fans on.

1 of 1 found this review helpful.

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Reviewer: SIMON from FL

Date: June 10, 2014

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Hayden Electric Fan Control

Summit RacingSummit Racing Verified Purchase

The first order was received with a unit that was incorrectly wired from the factory. Have not received the replacement unit at this time.

1 of 1 found this review helpful.

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Reviewer: DONALD from WA

Date: May 19, 2014

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Dual fan relay

Summit RacingSummit Racing Verified Purchase

Easy install, can run 2 fans but only one output is fused, need to wire a second fuse holder if you run 2 fans. Found fans will keep cycling many times after the truck is off. Can not wire the relay to constant power or the fans will continue to run long after the temp has dropped past 160. A/C input can also use it to start fans before the relay does it automatically. Only used for a few days so can't comment on long term quality. ...read more

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Reviewer: OLIVER from Canada

Date: April 25, 2014

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Works but came improperly wired

Summit RacingSummit Racing Verified Purchase

The function on this relay is good. It's easy to adjust and has reasonable consistency, however I'm not a fan of using the through-the-fin temperature sensor units on radiators. Having the wires for the air conditioner and the ignition are good, though. The major complaint with this unit is that two of the wires were put in the wrong locations. As such, when I wired it up per the instructions, at first it didn't work properly. Although the relay supposedly activates at 210F as the max temperature, at the max setting it turns on at around 225F coolant temp. I was wondering about this since my BMW has a 105C thermostat, but it works fine in this application. ...read more

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Reviewer: THEODORE from OH

Date: August 01, 2014

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Works great but requires some knowledge of ....

Summit RacingSummit Racing Verified Purchase

Two basic problems this device solves. 1. You have an older muscle car that you converted to an electric radiator fan and now would like it to go on automatically. 2. You have a "modern" car with an electric fan that is controlled by "the computer" aka PCM as I do with my 1997 Saturn SW2 / SL2 / SL first year of OBD2. In my case I replaced the head gasket and noticed after that the fan did not come on. It worked when the air conditioning was turned on. Wiring, fan motor, relays, ECTS aka temp sensor all tested good and no codes in the computer. For some reason the "computer" in my car would not activate the fan. Cleaned all contacts etc. At this point someone suggested a device like this. I'm handy with a multimeter, soldering, basic electronics knowledge - resistor, capacitor, etc. Install time: about 4.5 hours. Pre-install: I highly recommend identifying a + "positive" wire that comes on with the ignition and running that wire to the engine compartment first BEFORE ordering this kit. Once you have that order the kit and if you are not good with electronics get help from someone that is and pay them. Next, I only have one fan not two. If this is the case then fold the wire from the second fuse back and other stuff as you will not need them. You will be tempted to tap into a positive wire from the ignition coil - don't you could mess with your cars computer. I found a wire inside the car coming off the cigarette lighter or radio etc that comes on with the ignition and used that. CONS: instructions could have been clearer, they could make a YouTube video of a muscle car and a car like mine to make it easier to understand. Temp sensor - need access to both sides of the radiator - not easy on a "modern" 4 cylinder like my Saturn. could be designed better for easier install. Range: OEM fan comes on at 1/2 on the temp gauge and shuts off around 1/4. This comes on and the fan goes off as soon as it falls below the threshold. This causes the fan to go on and off more often. Not a big deal. In short, it is kind of a pain to install but is vastly superior to risking your motor over heating, running the fan all the time, installing a manual switch or trying endlessly and hopelessly to determine why the "computer" will not turn the fan on. ...read more

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Reviewer: PAUL from CA

Date: July 29, 2014

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Some parts are not legal for sale or use in California on any pollution-controlled motor vehicles

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