How do you fix a blower motor resistor?

How do I know if my blower motor resistor is bad?

Bad Blower Motor Resistor Symptoms

  1. Only One Speed From Blower Motor. One of the most common symptoms of trouble with the blower motor resistor is when the fan gets stuck in one setting. …
  2. Various Airflow Settings Not Working. …
  3. No Air Coming From Vents.

What causes blower motor resistor failure?

In most cases, a blower motor resistor fails due to corrosion or overheating. Sometimes, the mechanical resistance to the motor rotation causes an excessive electric current that can overheat and prematurely damage the blower motor resistor.

What happens when blower motor resistor goes bad?

If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. The heating and air conditioning systems may still function at one speed, however the resistor will have to be replaced in order for full functionality to be restored.

Is it the resistor or the blower motor?

Blower resistors are resistors which are used to control the fan speed of automotive blowers. The fan speed can be changed either by switching the blower resistor resistance mechanically using a rotating lever, or electronically by the air conditioning system.

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Can a blower motor resistor be fixed?

The average cost to replace the blower motor resistor at a repair shop is between $44 and $55 in parts and $70 in labor costs, for a total cost of around $114 to $125. On the other hand, you can easily fix the blower motor resistor at home in about an hour (even if you’re a beginner) and for around $70.

Does a blower motor resistor have a fuse?

A fuse is often located on the resistor board. The fuse only protects the low and medium blower speeds. High speed will still work if the resistor fuse is blown.

Can you repair resistors?

Resistors are easy to find if they have become defective because they can be measured with the electronic device turned off. Once a resistor is found to be defective, replacing it can return the electronic device to correct operation. Make sure you’re going to replace the resistor that’s defective.

Are all blower motor resistors the same?

Blower motor resistors have several resistors with different resistances. This controls the current that runs through the blower motor. Each fan speed selection is connected to one or more of the resistors in the blower resistor assembly.

Why does my blower motor fuse keep blowing?

Over time, dust and debris can make its way from the filters into the blower motor. This can cause the motor to overheat and eventually burn out. This can cause the furnace to blow a fuse and turn off. … If a wire becomes loose, it can short out, causing the fuse to blow.

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Why does my blower motor resistor keeps melting?

Trent, one of the biggest reasons for blower motor resistors to have shorten life is actually because of faulty blower motor drawing too many amps, some times melting wires/plugs, heating up resistors shortening their life. Many Dodge forums tell of this problem.

How do you test a blower motor resistor?

Place one lead of the Ohmmeter on terminal 1 of the resistor. Place the other lead on terminal 2 and check against specifications. If this circuit is open, showing infinity on the Ohmmeter, the blower resistor must be replaced. Move the lead from terminal 2 to terminal 3 and check this reading against specifications.

Is there a fuse for the blower motor?

Many vehicles have two fuses for the blower motor, one in the interior fuse block and the other under the hood. The blower motor is usually under the dashboard on the passenger side.