How do you diagnose a bad blower motor resistor?

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

Symptoms of a Bad or Failing Heater Blower Motor Resistor

  1. Blower motor stuck on one speed. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. …
  2. Blower motor does not work on certain settings. …
  3. No air from the vehicle’s vents.

Can a resistor work intermittently?

When the resister of the blower motor starts to fail, the motor operates only intermittently. … The higher current can make the jump across the resistor contacts that are going bad and get the blower motor to engage.

Will a blower motor resistor cause no heat?

The blower motor resistor is the part that controls the fan speed of the blower motor. Both of these components can fail, resulting in the heating system simply not working.

When a blower motor resistor fails What is the tell tale sign to the technician that the blower motor blower motor circuit needs to be looked at?

Common signs include the car’s heater not working or getting stuck on a certain speed, or something getting jammed in the blower motor.

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What happens when blower motor relay goes bad?

If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current from a bad relay will blow the fuse and cut power in order to protect the system.

What causes a blower motor resistor to go out?

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.

Can you fix a blower motor resistor?

The resistor module is easy and inexpensive to replace. It’s then typically installed in the ductwork, near the car blower—either under the dash or under the hood. (Refer to a service manual to locate yours.) Purchase a new resistor module at the auto parts store (usually less than $25).

What are the signs of a bad blower motor?

You might also hear ongoing whirring noises, or noises that change or get louder if you increase the fan speed. These are all signs of problems with the blower motor. In some cases, you may even notice smoke or smells of burning while driving, in which case you should pull over immediately.

How much does it cost to replace a blower motor resistor?

The average cost for a blower motor resistor replacement is between $119 and $161. Labor costs are estimated between $47 and $60 while parts are priced between $72 and $101. Estimate does not include taxes and fees.

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Why is my blower motor not working?

In a situation where the motor doesn’t work on any speed, the most likely causes are: a blown power supply fuse, a bad motor ground connection, bad motor speed control module or a failed motor. On all systems, a failed blower motor is least likely. … Start by checking the blower fuse and HVAC controller fuse.

Is there a fuse for the blower motor?

Fuse Protection

To protect the blower motor power circuit, a 20-, 25- or 30-amp fuse is usually located in the fuse panel under the dash. The rating of the fuse will depend on the vehicle application and how much power the blower motor requires at full speed.

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