• Home
  • What can cause a blower motor to stop working?

What can cause a blower motor to stop working?

Author of the blog (work in a car repair shop)
Ask Q

What can cause a blower motor to stop working?

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.

Is there a fuse for the blower motor?

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

If you have a faulty blower motor, you may experience low airflow from the vents, even when the fan is on high. There will be no air coming from the vents if your fan isn't working due to a bad blower motor resistor. Blown relay circuit fuses or melted relays are more serious signs of a bad blower motor relay.

Where is the blower motor reset button?

Locate the reset button on the furnace and press it to reset the furnace. It is usually located inside the blower compartment on the side of the blower motor. Be cautious as the housing may be hot. If the button is popped up, press it down.

How much does it cost to replace a blower motor?

Where is the blower motor fan fuse located?

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.

Where is the blower motor fuse relay?

Under the instrument panel, look under the glove box. On the right side of the fender wall you will find another fuse box. The blower motor fuse is easy to replace.

What causes heater blower not working?

If little air is coming through the vents (hot or cold), then it could be because the blower motor for the fan or a switch or resistor that controls fan speed isn't working. Another cause might be that the electronically controlled “blend doors” that direct air flow are stuck or broken.

What happens when blower motor resistor goes out?

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.

How do you test a blower motor relay?

Connect a test light or multimeter to the ground (black lead). Turn the ignition key to the on position (engine off), and remove the relay. Using the probe, test all terminal sockets in the relay connector. Two of the four should have power.

What relay controls the blower motor?

The blower motor relay controls the current used to power the blower motor, and is subject to the constant on and off switching.

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

The blower motor is operated by an electrically operated switch, called a relay. If the relay fails, the motor's fans will not blow conditioned air into your car. Fixing the relay usually costs around $50 to $80. So, if the blower motor relay fails, you could be left sweating or shivering.

Can you reset a motor?

Once the motor has cooled sufficiently it can be re-started, usually by pushing the popped-out reset switch back down. If the motor turns off again on re-set you should not keep running it as it may be damaged and the system may be unsafe.

How long do blower motors last?

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.

How long does a blower motor last in a car?

The blower is supposed to last the entire lifetime of your car. However, situations vary and some climates require the fan to be used too often. Many car owners find themselves having to replace the blower after five years. The quality of the motor used to power the blower matters.

Where is the blower fan resistor located?

The blower motor resistor is usually extremely easy to access, but the hard part can be positioning your body inside the car to remove the part. The resistor is at the bottom of the HVAC housing or just behind the glove compartment.

What relay controls the blower motor?

The blower motor relay controls the current used to power the blower motor, and is subject to the constant on and off switching.

Does a blower motor have a relay?

In a blower motor, the relay supplies the power that allows the fans to circulate warmed air. Essentially an on/off switch, the blower motor relay's reactions start and end the heating process in HVAC systems by controlling the flow of current between the power source and the motor.

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.

How can I tell if a relay is bad?

You want to feel and listen for any clicks. If you feel and hear clicks, the relay works on one side – the side with the energizing circuit and coil. However, if there was no sound from the horn, the relay has a problem along the contact circuit.

Where is the best place to find the location of a blower relay?

The blower motor relay is generally located in the under-hood fuse box or in the under-dash fuse box. A blown fuse can mimic relay failure.

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.

Where is the blower motor reset button?

Locate the reset button on the furnace and press it to reset the furnace. It is usually located inside the blower compartment on the side of the blower motor. Be cautious as the housing may be hot. If the button is popped up, press it down.

How much does it cost to replace a blower motor?

Why is my car not blowing air at all?

Here are some of the most common causes of why air doesn't flow out of your vehicle's vents: Your air intake is clogged, meaning that air isn't getting in from the outside at all or isn't circulating properly. There is a blown fuse in the ventilation system. Electrical issues such as a bad relay.

Why is my AC fan blower motor not working?

The most common causes for AC fan blower motor not working are blown fuse, bad relay, resistor or control module malfunction and faulty blower motor. However, a bad electrical connector or broken wire, or a defect in the climate control unit can also cause the blower motor to stop working.

What happens when the blower motor on a car goes bad?

A bad blower motor will sometimes overheat, causing a “hot” smell to come out of your air vents. In the worst scenarios, your blower motor may actually start to burn. Yikes! What causes a bad blower motor?

What causes a blower motor resistor to fail?

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 causes a heater fan to stop working in a car?

In some cars, a failed blower motor resistor can cause a heater fan to stop working completely. In most cases, a blower motor resistor fails due to corrosion or overheating.

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

How long does a heater blower last?

Can you drive with a bad blower motor?

Tired of looking for a video for your question?

Video Answer below 👇

Were our answers helpful?

Yes No

Thanks so much for your feedback!

Have more questions? Submit a request

FAQ for the last Day

  • Will adding coolant help heat?
  • Adding coolant does nothing to address the problem that caused your engine to overheat in the first place, but it often allows you to drive safely to the nearest repair station. “A professional will need to inspect your car's cooling system,” says Reina. While driving, keep an eye on the temperature gauge.Does coolant help with heat? What Does Coolant Do for My Engine? The primary purpose of coola...


  • Why has my car heater stopped working?
  • A heater can stop working for a number of reasons, including: A low antifreeze/water level in the radiator due to a leak in the cooling system. A bad thermostat that isn't allowing the engine to properly warm up. A blower fan that isn't working properly.Common reasons for the heating system not to work include the following: Low coolant Air in the coolant system Malfunctioning heater core Failed (...


  • How long does it take to replace heat pump?
  • A simple back to back installation can be done in as little as 3 hours, but generally takes around 5 hours. More complex systems can take up to a day (or possibly longer) depending on the complexity of the system.On average, heat pumps typically last around 15 years or longer. If your heat pump isn't the right capacity for your home, you may need to replace it as much as 5-10 years sooner. Heat Pu...


  • Can you drive a car without heat in the winter?
  • If you're in a hurry and just want an answer to the above question, it's no. You no longer need to warm up your car in winter — for your car's sake — unless it's old enough to have a carburetor (unlikely unless it's at least 30 years old), or it's electric or a plug-in hybrid.If you’ve been warming your car up in the winter before getting on the road, you are doing more harm than good. Experts are...


  • How long does it take to install heater?
  • On average, it takes about four to 10 hours to wrap up a furnace install, depending on the type and size of the unit. As expected, a larger, more complex model will take more time and effort than a standard unit.How long does it take to install an electric heater? For other systems, such as furnaces and heat pumps, the work can take longer. A good ballpark figure for an average job is 3 to 5 days....


  • Is your car heater blowing cold air then hot?
  • If your car heater is blowing cold air, then it's time to get that hot air back. Whether it's not enough coolant, broken heater controls, a bad heater core, a leak, or a bad thermostat, we can find the issue and get it resolved.Air in the cooling system impedes the circulation of coolant in the system, and as a result, the heater blows hot air only when driving, and cold air at idle. The coolant s...


  • What are the most common problems that affect the car heating system?
  • In most cases, car heater issues fall under two headings: There could be a blockage or other problem stopping heated antifreeze from moving through the heater core component. A valve or switch could be faulty, or the heater core could be a clogged.Water leaks can be a significant problem in car heaters. You need to check hoses, radiators and water pumps regularly to detect the water leaks. If any...


  • How do you fix a car heater that is not working?
  • In most cases, car heater issues fall under two headings: There could be a blockage or other problem stopping heated antifreeze from moving through the heater core component. A valve or switch could be faulty, or the heater core could be a clogged.If your car heater is not working at all, you're looking at a faulty blower motor, or an issue stopping power from reaching the blower motor. In order t...


Comments

Leave a Comment

<
Email us