How do you tell if the blower motor is bad or the resistor?

How do you diagnose a bad blower motor resistor?

If the airflow from the vents is weak…

If you try to increase the air pressure and you feel no difference in the pressure blowing, then your blower motor resistor may be failing. A damaged blower motor resistor will work on one fan speed which may not be enough to keep the inside of your car cool or warm enough.

What does a bad blower resistor look like?

The most common symptom of a failed blower motor resistor is when the heater fan only runs at the highest speed setting (4 or 5) and doesn’t work at low speeds. In some cars, a failed blower motor resistor can cause a heater fan to stop working completely.

What are signs of a bad blower motor?

Here are just a few of the signs that your blower motor is going bad.

  • Weak airflow. This is one of the first signs of a bad blower motor that people tend to notice. …
  • Noises. Have you noticed any unusual noises coming from your vehicle’s HVAC system? …
  • Smoke or smells.
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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.

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.

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

As we can see, the blower motor resistor costs between $150 and $400 and can usually be completed in about an hour to an hour and a half. These repairs are fairly simple and usually on the cheaper side for most common vehicles.

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 does a bad blower motor sound like?

You might hear this as a noise coming from directly behind the vent, perhaps a light slapping, or a sudden pop before you notice a problem with airflow. Whirring noises might also result from a bad bearing in the motor. … This is a telltale sign of a bad blower motor.

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What can cause a blower motor to stop 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.

How much does it cost to fix a blower motor?

Cost to Replace Central or Forced Air Blower Motor

Replacing a blower motor costs $450 on average with a typical range of $250 to $800. With a warranty, you might pay as little as $150 for labor alone. For high-end models, like those with large motors or access issues, you might pay as much as $2,000.

Can you drive with a bad blower motor?

If your blower motor stops working or even short circuits, you will have no airflow produced for the system. … Additionally, a bad blower motor can also disable a completely operational A/C and heating system. Of course, you will not want to drive your car in extreme heat or cold from outside.

How long does it take to replace a blower motor in a car?

This is around a 4 hour job by an experienced Tech. At home, by a Novice with decent skills, about 5 hours plus!

How long does a car blower motor last?

For the most part, the heater blower motor on your car is supposed to last as long as the actual vehicle does. Due to the harsh conditions that this blower motor has to operate in, it will usually end up having repair issues. There are a variety of problems that the blower motor may have that will render it useless.

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