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What causes a blower motor to fail in a car?

Author of the blog (work in a car repair shop)
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What causes a blower motor to fail in a car?

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.Rust formation inside the motor is another reason a blow motor may fail. Rust will cause a motor to seize up and prevent the motor from spinning. If your blower motor has bad bearings, damaged windings, or is otherwise seized up, then you’ll need to replace the motor.

What causes a blower motor in car to go bad?

Blower motors go bad due to one of a few reasons: Overheating from airflow restriction. Bad bearings. Damaged fan blade/scraping sides.

How long does a car blower motor last?

What happens if blower motor fails?

Power to the blower motor is fed through the blower motor resistor, so if it fails or has any issues power can be cut off to the motor. A blower motor without power will not be able to produce any air pressure, and as a result the heating and air conditioning system will be left with no air coming from the vents.

What causes a blower motor in car to go bad?

Blower motors go bad due to one of a few reasons: Overheating from airflow restriction. Bad bearings. Damaged fan blade/scraping sides.

How much does it cost to replace a blower motor in a car?

How much does it cost to replace 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 a car without a blower motor?

Your car's blower motor is not only necessary for the operation of your air conditioner. Without a functioning blower motor your engine runs the risk of overheating.

How do I know if it's my blower motor or resistor?

Typically, if the fan will work on some speeds but not on others, the resistor is suspect. Okay, let's say there's no melting going on, but your fan doesn't work on all speeds. Typically, if the fan will work on some speeds but not on others, the resistor is suspect.

How long does it take to replace a blower motor?

How long does it take to replace a blower motor? Replacing a blower motor takes 2 to 3 hours on average. The blower motor is typically located behind a control board and other furnace parts.

Can a blower motor be repaired?

There are a number of things that can go wrong with your heating system, but if the air stops blowing altogether and the same is true on cold air settings, a blower motor replacement is likely in order. The good news is that it's a fairly straight forward repair.

Is there a fuse for blower motor?

Can I run my car without a blower motor?

Your car's blower motor is not only necessary for the operation of your air conditioner. Without a functioning blower motor your engine runs the risk of overheating.

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

Signs of a Bad Blower Motor Resistor Loss of HVAC fan control (total or certain speeds) The fan only works on its highest speed setting. No air coming from vents. Intermittent or inconsistent fan speed.

What causes a blower motor in car to go bad?

Blower motors go bad due to one of a few reasons: Overheating from airflow restriction. Bad bearings. Damaged fan blade/scraping sides.

What happens if blower motor fails?

Power to the blower motor is fed through the blower motor resistor, so if it fails or has any issues power can be cut off to the motor. A blower motor without power will not be able to produce any air pressure, and as a result the heating and air conditioning system will be left with no air coming from the vents.

What is the difference between a fan motor and a blower motor?

What Is a Blower Motor? Unlike the condenser fan motor, the blower motor is located indoors. It's the component that blows cool air through the ducts and into different parts of your home. So it's essentially your air mover.

How many blower motors are in a car?

The number of blower motors in your vehicle depends on its climate control system. Some cars have one blower motor, but that may not be the case for some SUVs and vans. They may have two motors, one in the heater box and another in the vehicle's rear area.

Is it hard to replace a blower motor?

The replacement of the blower motor is common and straightforward, so most shops will perform the repair — many on the same day.

Where is a blower motor located?

The blower motor is usually under the dashboard on the passenger side. Blower motors that make loud squeaks or rattling noises may be worn out and on the verge of packing it in, but sometimes those noises are caused by leaves or other debris that can be cleaned out after the motor is removed from the vehicle.

Why is the blower motor making noise?

Furnace blower motor noise when starting is likely due to damaged or worn-out parts. Humming, screeching, or thumping sounds are usually signs of underlying problems. Identifying and correcting the issue can get rid of the sound and also ensure the longevity of the wider furnace system.

Why do I have to hit my blower motor to work?

Blower motor only start working after i hit a bump. In most cases that is a sign of worn down blower motor brushes not making a good contact. In some cases the blower motor/resistor pigtail could cause erratic operation of the blower motor too.

When should I replace my blower motor?

If the motor is making rattling, clanking, or banging sounds, it may be because of a loose or broken part. Loud banging sounds are especially worrisome. They're usually a sign that something is damaged or disconnected. And this may mean replacing the blower motor.

What happens when a 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 blower motor resistor?

How much does a blower motor resistor cost? To replace the blower motor resistor, it would cost you anywhere between $50 to$150 – this includes the cost of equipment and labor. However, by doing it yourself at home, you can save up to $70.

Why is my blower fan not working?

If you see or hear the fan turn on, your blower motor is not the culprit. If the fan does not start, you have a wiring issue (circuit breaker trips) or motor problem (circuit breaker does not trip). While your thermostat may be at fault, only an HVAC technician can diagnose and remedy the issue correctly.

Why is my blower motor not working on my car?

A car blower motor develops problems due to: Electrical problems such as faulty switch, blown fuse, damaged resistor or control module, bad relay (if it uses one), and corroded, melted, or loose connectors Worn motor parts such as brushes and bearing or burnt out motor components like coils and commutators

What causes a blower motor resistor to fail?

However, as a side effect of reducing current flow, resistors generate heat. Over time, that heat can cause the resistor to fail naturally. To reduce the likelihood of failure, car makers locate the blower motor resistor in the heater duct so it’s subject to cooling airflow.

What causes a blower motor relay fuse to blow?

Blown fuses One of the first symptoms of a bad or failing AC blower motor relay is a blown AC blower motor relay circuit fuse. 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.

What happens when the blower control module fails?

In most cases when a blower control module fails, the blower motor doesn't work at all. In some cars (e.g., older GM trucks), a failed blower control module or processor can cause the blower motor to continue running even with the ignition OFF.

Below you will find two interesting articles on a similar topic 👇

How do you know if your blower motor in car is bad?

How do I know if it's the blower motor or the resistor?

Tired of looking for a video for your question?

Video Answer below 👇

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