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Sold by: Premier Auto Part
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Hayden 3651 Universal Add-On Adjustable Thermostatic Fan Control Kit, Custom Fitting & Wiring Required

4.0 4.0 out of 5 stars 613 ratings

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About this item

  • Adjustable thermostatic fan control
  • For use with Rapid-Cool and super duty electric fans
  • Contains gaskets, o-rings, or seals to properly replace the product
  • Zinc coated terminal to resist corrosion
  • Screw-In Type/Thread-in probe for installation in water jacket or radiator
  • Adjustable thermostatic fan control
  • For use with Rapid-Cool and super duty electric fans
  • Thread-in probe for installation in water jacket or radiator
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From the manufacturer

About Us

Since the invention of the transmission cooler by Mr. Perry Hayden in 1961, Hayden has continued to add innovative products to meet the needs of its customers while investing in continuous improvements and maintaining quality.

Hayden Automotive engineers, manufactures and supplies a wide range of products designed to keep your car, truck or performance vehicle running cool. From fan clutches and electric fans to performance oil and transmission coolers, we’ve got what you need to protect your vehicle from damaging and performance robbing heat.

Product Description

It is a premium adjustable fan control with Screw-In Type/Thread-in probe that installs in the radiator fin section. It includes wire harness and air conditioning override relay. It is adjustable from 160 to 210 degrees Fahrenheit. It powers two fans up to 30 Amps.Adjustable from 132°F – 248°F across all controllers.

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Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Hayden 3651 Universal Add-On Adjustable Thermostatic Fan Control Kit, Custom Fitting & Wiring Required


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What's in the box

  • Control Kit
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    Customer reviews

    4 out of 5 stars
    4 out of 5
    613 global ratings

    Customers say

    Customers like the ease of installation of the electronic component fan. However, they report issues with the relay and quality of the product. For example, they say it catches on fire, the controller goes up in smoke and the fan won't shut off. Opinions are mixed on performance and temperature adjustment.

    AI-generated from the text of customer reviews

    35 customers mention30 positive5 negative

    Customers find the installation of the electronic component fan to be easy. They mention that the kit makes it easy to wire it up and is well worth the money. Some say that the sending unit isn't a normal thread size so an adapter is required.

    "Well worth the money Hooked it up easily used all the wires & functioning just fine. Seems like decent quality,good wires on it..." Read more

    "...I do like the ease of the wiring though & for the price I can live with the variable temp. swing ." Read more

    "...This kit makes it easy to do that." Read more

    "...I got about a year or so on each of them and then they burnt out. Easy to install. Just won’t last." Read more

    64 customers mention42 positive22 negative

    Customers are mixed about the performance of the electronic component fan. Some mention it works pretty good the time it lasted, and wonderfully when wired correctly. However, others say that it started working unreliably and the relay started not working. The AC line didn't work as it should, and the fans wouldn't come on until they got out and tapped. The behavior became erratic after about a week.

    "...So far this works wonderfully when wired correctly. The wires to the fuses are pretty loose so a little epoxy was added...." Read more

    "Well worth the money Hooked it up easily used all the wires & functioning just fine. Seems like decent quality,good wires on it..." Read more

    "The temperature is +/- 10-12 degrees sometimes and is sporadic in the set range...." Read more

    "They worked pretty good the time they lasted. Purchased two and installed at the same time. One died in four months and the other died in 6 months...." Read more

    21 customers mention7 positive14 negative

    Customers have mixed opinions about the temperature adjustment of the electronic component fan. Some mention that it works well and the vehicle runs cooler, while others say that it doesn't work as expected and the fan constantly runs.

    "...a year, then the contacts in the controller go out and you no longer have a cooling fan...." Read more

    "...Fans are okay. I rate them two stars because when they worked they worked good. I am no amateur or novice at any kind of wiring...." Read more

    "...The two I received do not have the proper heat probe...." Read more

    "...But about a month ago, noticed the temp was getting way too hot, almost overheated, so I had to pull over, get out, and wiggle the controller back..." Read more

    7 customers mention3 positive4 negative

    Customers are mixed about the wires. Some mention that the wiring is good and easy to wire in, while others say that the wire was fixed to the probe with no connector. The wires to the fuses are pretty loose, and the second fan wire is not fused.

    "...Seems like decent quality,good wires on itRunning two fans on it pro tip from mechanic..." Read more

    "...So far this works wonderfully when wired correctly. The wires to the fuses are pretty loose so a little epoxy was added...." Read more

    "...Checked the relay and the wiring is good." Read more

    "...like it was made to screw into a coolant port but the wiring was fixed to the probe with no connector to disconnect it so the wires wouldn't get..." Read more

    33 customers mention7 positive26 negative

    Customers are dissatisfied with the quality of the electronic component fan. They mention that it failed quickly, the directions didn't match the color of wires, and it didn''t last long. Some say that the product was dead out of the box and didn';t work after about 10 minutes of use.

    "...One died in four months and the other died in 6 months. I ran one to one radiator fan and one to the other radiator fan...." Read more

    "...Never again. I got about a year or so on each of them and then they burnt out. Easy to install. Just won’t last." Read more

    "...Someone clue me in here. It cools fine. It doesn't cycle as it should. It runs with the stock fan and fan clutch." Read more

    "...Seems like decent quality,good wires on itRunning two fans on it pro tip from mechanic..." Read more

    11 customers mention0 positive11 negative

    Customers are not satisfied with the relay of the electronic component fan. They mention that it can catch fire, burn their hand, and the controller went up in smoke. Some say that the relay in the controller chattered away and can be heard switching on and off constantly.

    "...relay directly in line of the fan power input because this controllers fuse would blow whenever the fan was activated, not a big deal and I was..." Read more

    "...Even doing this, the first time I started the engine, one controller went up in smoke. The other controller didn't catastrophically fail...." Read more

    "...from the moment that the key was turned on--the relay in the controller chattered away...." Read more

    "...The relay can be heard switching on and off constantly until its either hotter than the set temperature or until it cools down under the set..." Read more

    9 customers mention0 positive9 negative

    Customers are dissatisfied with the shut off of the electronic component fan. They mention that the fan would never shut off, it would kick on and off at least 5 times a second, and that the control system is not working.

    "...install this fn controler in my ford v8 from 85 and the controlint system is not working anymore after 2 months and few days of use...." Read more

    "...Wired as per the instructions. Cannot get the fan to cycle off. Yellow is to Accy and green to cooling clutch wire. Am I missing something?..." Read more

    "...warmed up to the temp that I set for the fan to turn on, the fan will kick on, then kick off, 5-6 times for 1/2 second each turn on, before finally..." Read more

    "...when the thermostat opens then once you are warmed up the thing never turns off then you fave fans running non stop you have to set it to a..." Read more

    Idem different than described
    3 Stars
    Idem different than described
    I've used these before. Ordered 2 because I've used them. They work great however these two I bought are not packaged with the right idem. The two I received do not have the proper heat probe. The ones I got should be prongs that you push through the radiator but these had a screw in fitting. It was clear these were orginal packed and not a return someone repacked. These do work great. Just the ones I got are not packaged with the right part.
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