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Auxiliary Fan Resistor

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Dorman 902-706 Auxiliary Fan Resistor - Direct Fit
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$31.14
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Warranty : Lifetime Dorman limited warrantyAnticipated Ship Out Time : Same day - 1 business dayQuantity Sold : Sold individually
GenuineXL 964-616-550-02 Series Resistor (in Blower Duct) for Engine Compartment Blower Motor - Replaces OE Number 964-616-550-02
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$66.84
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Warranty : 24-month limited warrantyAnticipated Ship Out Time : Same day - 1 business dayQuantity Sold : Sold individually
GenuineXL 993-616-521-01 Series Resistor - Replaces OE Number 993-616-521-01
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$83.89
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Warranty : 24-month limited warrantyAnticipated Ship Out Time : Same day - 1 business dayQuantity Sold : Sold individually
GenuineXL 996-616-101-00 Series Resistor for Auxiliary Fan - Replaces OE Number 996-616-101-00
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$167.78
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Warranty : 24-month limited warrantyAnticipated Ship Out Time : Same day - 1 business dayQuantity Sold : Sold individually
Motorcraft WPT-822 Auxiliary Fan Resistor - Direct Fit
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$37.71
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Warranty : 2-year or unlimited-mile Motorcraft limited warrantyAnticipated Ship Out Time : Same day - 1 business dayQuantity Sold : Sold individually
Motorcraft WPT-861 Auxiliary Fan Resistor - Direct Fit
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$26.90
Product Details
Warranty : 2-year or unlimited-mile Motorcraft limited warrantyAnticipated Ship Out Time : Same day - 1 business dayQuantity Sold : Sold individually
Motorcraft WPT-861 Auxiliary Fan Resistor - Direct Fit
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$26.90
Product Details
Location : RearWarranty : 2-year or unlimited-mile Motorcraft limited warrantyAnticipated Ship Out Time : Same day - 1 business dayQuantity Sold : Sold individually
Motorcraft WPT-861 Auxiliary Fan Resistor - Direct Fit
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$26.90
Product Details
Location : FrontWarranty : 2-year or unlimited-mile Motorcraft limited warrantyAnticipated Ship Out Time : Same day - 1 business dayQuantity Sold : Sold individually
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Auxiliary Fan Resistor Guides

Quick Tips in Buying an Auxiliary Fan Resistor

A car's ignition system can reach a very high temperature if it runs non-stop. The auxiliary fan is an important part in a car's engine in this aspect. The fan keeps the engine, along with other internal parts, cool in the middle of running. More so, the fan's performance depends on a small and simple device called the auxiliary fan resistor. And once this resistor short circuits-which it normally does-the car's performance will be affected. Hence, the auxiliary fan resistor should be replaced immediately. Following are simple tips on how to look for the correct auxiliary fan resistor for your vehicle.

The two types of auxiliary fan resistors

Common in the market and in stock parts today are two types of auxiliary fan resistors. The first has terminal rings with it and is attached into the auxiliary fan with the use of screws. The second is a smaller type that is being spliced into the connection of the wires in the auxiliary fan. Check your car and see which type of auxiliary fan resistor your car has.

Proper wattage and resistance

The auxiliary fan resistor's function is to regulate the electricity going into the fan. This function allows the fan to run in either high or low speed depending on the car's condition. Without the resistor, the auxiliary fan will not run in low speed or not spin at all. With this in mind, it is important to look for the best auxiliary fan resistor that has the correct electricity resistance but can handle high volts.

The ideal combination is having a resistance of 0.7 to 0.8 ohms with the capacity of 100 watts. Most auxiliary fan resistor in the market has a resistance of 0.6 ohms and it works fine. You can also opt to do a combination of, for example, four pieces of 2-ohm-by-25-watt resistors to have a 0.5 ohms x 100 watts.

Get certain

If you look into online stores for aftermarket auxiliary fan resistors, you will notice that each unit is compatible only with a particular make and model-sometimes, even the year. While buying a similar resistor unit could not cause any harm, it is better to check the OEM number of your old auxiliary fan resistor and buy the very same unit for its replacement. It is also advisable to talk to your seller or consult the Internet before deciding to buy a similar auxiliary fan resistor unit.

Installing a New Auxiliary Fan Resistor

A bad auxiliary fan resistor can cause a lot of overheat problems. To prevent this dilemma from getting out of hand, this faulty part should be replaced as soon as it shows signs of deterioration. And since the resistor is just a small part in the vehicle, there is no need to go to the mechanic and waste $900. You can simply buy a new auxiliary fan resistor online and do the installation yourself. While there can be a lot of parts that need to be removed, replacing the resistor can only take a maximum of three hours. Following are simple steps on how to replace the auxiliary fan resistor.

Difficulty level: Moderate

Tools required:

  • Blanket
  • Electrical tape
  • Flat head screwdriver
  • Jack lift
  • Jack stands
  • Needle nose pliers
  • New screws
  • Ratchet set
  • Socket set
  • Torx screwdriver
  • WD-40

Step 1: Prepare all the tools and supplies needed.

Step 2: Park the vehicle on a flat leveled driveway.

Step 3: Using jack lifts, raise the front of the car.

Step 4: Secure the position of the front of the vehicle with jack stands.

Step 5: Set the blanket in front of the bumper and make sure it does not fly away.

Step 6: Pop the hood and locate your auxiliary fan. It is most likely seen right in front of the radiator.

Step 7: Locate the auxiliary fan resistor and check if you can simply raise the hood to access it or you need to have the grilles and even the fog lights removed.

Step 8: With the use of the screw sets, remove the parts that keep you from accessing the auxiliary fan resistor. Use WD-40 or any other penetrating oil to loosen the rusting screws.

Step 9: Remove the old auxiliary fan resistor by cutting the wires connecting it to the auxiliary fan. If your resistor is the ballast type, you will need to use a screwdriver to remove it as well.

Step 10: Put the new auxiliary fan resistor into place and use the electric tape to join the wires connecting to the resistor.

Step 11: Check whether the auxiliary fan and the resistor are connected and placed well. It is better to realize something is disconnected now than later when everything is screwed into its place.

Step 12: Using new screws, replace the grilles, fog lights, or whatever was removed to access the auxiliary fan resistor.

Step 13: Lower the car and remove the jack lifts.

Step 14: Start the engine and check whether the auxiliary fan is working with its low and high speeds.

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