Symptoms of a Bad or Failing Heater Blower Motor

1. Weak airflow from the vents. One of the first symptoms of a potential problem with the vehicle's heater blower motor is low airflow from the vents.
2. Fan only blows at certain speeds. Another symptom of a bad or failing heater blower motor is a motor that only functions at certain speeds.
3. No air from the vents.

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Accordingly, how do you know if your blower motor is going out?

Signs That Your Car's Blower Motor Is Going Bad

1. Weak airflow. This is one of the first signs of a bad blower motor that people tend to notice.
2. Noises. Have you noticed any unusual noises coming from your vehicle's HVAC system?
3. Smoke or smells. In some cases, you may even notice smoke or smells of burning while driving, in which case you should pull over immediately.

Secondly, how do you tell if it's the blower motor or resistor is bad? Usually a bad or failing blower motor resistor will produce a few symptoms that can alert the driver of a potential issue.

Symptoms of a Bad or Failing Heater Blower Motor Resistor

1. Blower motor stuck on one speed.
2. Blower motor does not work on certain settings.
3. No air from the vehicle's vents.

One may also ask, 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 do you test a blower motor?

If the blower motor isn't running you should:

1. Use voltmeter or ohmmeter to check for a blown fuse. If you find one, replace it.
2. Start car and see if blower motor works.
3. If the circuits are in good repair but the blower motor keeps blowing fuses, replace the blower motor [source: You Fix Cars].

Related Question Answers

Where is the blower located in the AC unit?

The blower fan is located inside a horizontal air conditioning unit in many home air conditioning systems, especially when the air handler is located in an attic or crawl area.

Will AC fan run if capacitor is bad?

Symptoms Of a Bad HVAC Capacitor If you take a stick and spin the fan blade and the condenser fan starts to run, the run capacitor has likely failed. Even though the fan is operating, we recommend that the AC unit should be shut off. Without the run capacitor in the circuit, the motor will pull excess amperage.

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.

How long do HVAC blower motors last?

Both types of motors are built to last up to 20 years with minimal maintenance required. The primary reasons that a motor might fail before its time are overheating and excess moisture.

What is a blower motor HVAC?

A blower motor is the component within a home's HVAC system. The motor blows heated air through vents when the heating system is in use. Conversely, some blower motors blow cold air when the air conditioning system is in use. There are two main types of blower motors: single-speed motors and variable-speed motors.

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.

How much should it cost to replace a blower motor?

The average cost for a blower motor replacement is between $364 and $394. Labor costs are estimated between $86 and $109 while parts are priced between $278 and $285.

How long do blower motors last?

10 to 20 years

Why is there no air coming from vents in my car?

Common reasons for this to happen: Blown fuse: Like many electrical units in your car, the ventilation system relies on a fuse for overcurrent protection. If the ventilation system's fuse blows, then the circuit will stop working, and there will be no power for the vents. Bad relay: A bad relay can also be responsible.

How much is a blower motor for an AC unit?

If a blower motor breaks down, an HVAC professional can replace it for $400–$600, including parts and labor. If a blower motor is a more expensive model, such as a newer variable-speed motor, replacement could cost up to $1,300.

Is there a fuse for the blower motor?

The blower motor is powered by a fuse-like device called a relay. If your heater or air conditioner does not blow air through the vents, this could indicate that the blower motor fuse has probably blown. While replacement is easy, the exact location of your blower motor fuse may vary from vehicle to vehicle.

Why does my blower motor work sometimes?

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. Blower resistors are small parts that can become corroded or just burn out, and a new one often costs less than $50.

Can a blower motor be repaired?

Typically, the air conditioner blower motor will be replaced with a stock blower motor from the HVAC supply store. Sometimes from a stock blower motor on the truck. The blower motor may not be the same brand, but it is important. There are blower motors that are reversible with a simple wiring change.

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 is a blower motor relay?

The average cost for a blower motor relay replacement is between $74 and $85. Labor costs are estimated between $38 and $49 while parts are priced at $36.

How long does it take to replace a blower motor resistor?

about 45 minutes

How do you know if your AC relay is bad?

Signs of a Bad or Failing AC Compressor Relay

1. Inconsistent cooling. The AC compressor is powered by the relay.
2. AC compressor is not turning on. One of the most obvious signs that the AC relay may have a problem is that the compressor is not coming on at all.
3. No cold air.

How do you know if a resistor is bad?

Set a digital multimeter for "ohms." Set an ohms range that is equal to or higher than the value of the resistor to be tested. Touch the red lead from the meter to one side, and the black lead to the other. Resistors do not hold a polarity, so it doesn't matter which side gets the red or black lead.

How do you replace a blower motor resistor on an air conditioner?

Difficulty

1. Remove the negative battery terminal.
2. Locate the blower motor resistor on the passenger side under the dash board.
3. Disconnect the electrical connector to the blower motor resistor.
4. Remove the screws or bolts to the blower motor resistor and remove the resistor.
5. Installation is the reverse of the removal.