What Does A Blower Motor Resistor Do? new for 2022

You are watching: What Does A Blower Motor Resistor Do? In amortips.com

Contents

What Does A Blower Motor Resistor Do?

The blower motor resistor is responsible for controlling the blower motor speed. In the past, this was done by varying the voltage supplied to the blower motor. In newer applications, the blower motor resistor is actually a solid state module that sends a varied signal to the blower motor.

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

Symptoms of a bad heater blower motor resistor

Fan does not work at all, so no air comes out of the vents.
Fan only works on some speeds and not others.
Fan only works on the highest speed.
Fan runs all the time and can’t be controlled with the fan switch.
You see smoke coming out of the vents.

What happens when the 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.

What are the symptoms 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.

Can you drive without a blower motor resistor?

except blower motor resistors don’t “wear out”; they stop working altogether, suddenly, when the resistance wire inside burns through. Even then, it’s safe to drive the car provided that it has no exhaust leaks which might permit carbon monoxide or oxides of nitrogen to enter the passenger compartment.

Can you fix a blower motor resistor?

Why does my blower motor only work on high?

Most car manufacturers use a series of resistors to make the heater blower motor run at different speeds. And when one or more of these resistors burn out, you’re usually left with only one heater blower motor speed—high. The resistor module is easy and inexpensive to replace.

How do I test a blower motor resistor?

Place one lead of the Ohmmeter on terminal 1 of the resistor. Place the other lead on terminal 2 and check against specifications. If this circuit is open, showing infinity on the Ohmmeter, the blower resistor must be replaced. Move the lead from terminal 2 to terminal 3 and check this reading against specifications.

READ: What Does Cvt Stand For?

Are blower motor resistors supposed to get hot?

This would be normal. Many blower motor resistors are designed such that they would burn up if they are not in the path of the air from the blower fan.

Can a blower motor resistor be intermittent?

Reduced airflow is when the blower motor is trying to move air through the vents but the resistor isn’t sending enough power to move the air with much pressure. … Depending on how much resistor is still functioning, the reduced airflow could be an intermittent problem.

How do you troubleshoot a blower motor?

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

Blower Motor Resistor Replacement Cost – RepairPal Estimate. Labor costs are estimated between $44 and $55 while parts are priced between $64 and $82. This range does not include taxes and fees, and does not factor in your specific vehicle or unique location. Related repairs may also be needed.

Can you drive a car with bad blower motor?

A bad heater blower motor will not affect the safety of your car, with the possible exception of you not being able to clear the windshield of snow, ice, or condensation if the defrosters don’t work. But you won’t be comfortable inside your car, especially during the cold of winter and the heat of summer.

How important is a heater blower motor?

The blower motor is an important part of your vehicle’s air conditioning and heating system, as it allows you to control the temperature inside the cabin.

How much does it cost to replace a motor blower?

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.

How do I reset my blower motor?

How to Find and Reset your Furnace Motor Blower

Step 1: Turn off the power to the furnace. …
Step 2: Remove the blower compartment cover. …
Step 3: Make sure the blower is completely cooled off. …
Step 4: Locate the reset button. …
Step 5: Press the button in (assuming that this is your issue and that the button has popped).

READ: How Much Is A 2016 Land Rover?

What causes AC blower to stop working?

One of the most common reasons fans stop spinning is because of a dead capacitor. … Each air conditioning system has several capacitors, including the start capacitor, which sends signals to the motor, and the run capacitor, which keeps the motor running. Capacitors can go bad over time and need to be replaced.

Can I bypass blower resistor?

In the highest speed state, the blower resistor is bypassed completely and the fan is connected directly to the car’s battery, which allows maximum current through the motor. 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.

How can you tell 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 bypass a cooling fan resistor?

Registered. The resistor just gives you the low speed fan. You can simply bypass by unplugging the two wires connected to it and connect those together. The result will be that when the low speed fan is called, you will get the full speed fan.

How do I know if my heater relay is bad?

Symptoms of a Bad or Failing Blower Motor Relay

Blower motor does not function. One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function at all. …
Blown fuses. …
Melted relay.

Does a resistor get hot?

Burning of Resistor

When a resistor has been overloaded with voltage exceeding its power rating, the resistor will become very hot to touch, darken considerably and possibly even melt or catch on fire. Although a resistor may appear damaged at this point, it can still be functioning.

Why does my blower only work sometimes?

When a resistor fails, the fan will often run only at higher speeds or the highest speed, no matter what fan speed is selected. … When a blower resistor fails, the highest fan speed usually is the only one that still works because it essentially bypasses the resistor and receives the maximum amount of voltage.

READ: How Safe Are Honda Civics?

Why is my AC running but not blowing air?

If the AC unit is running, but there is no air through the vents, you are likely dealing with a fan capacitor that has reached the end of its life. Fan capacitors help get your HVAC system’s outdoor and indoor fan motors blowing and your compressor running.

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

takes about 45 minutes.

How do you change the blower motor resistor?

How to Change a Blower Motor Resistor

Locate the blower resistor under the dash on the passenger side of the car. …
Disconnect the wire harness connector on the resistor using the small flat-head screwdriver. …
Remove the resistor, and then install the new one.

How much is a resistor on a AC?

How Much Does a Blower Motor Resistor Replacement Cost? A blower motor resistor costs anywhere between $1 and $400.

What does a bad blower motor sound like?

A defective blower motor will make a continuous sound noticeable by the passengers in the vehicle. It can manifest as a knocking, whirring, clunking, vibrating, squealing, or whining noise that persists until the blower motor is replaced.

Can a car run 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. … Start car and see if blower motor works.

Can a bad blower motor cause overheating?

This may be due to a faulty heater blower motor or potentially a bad heater core. … Engine overheating can be caused by a number of things such as low coolant levels, a faulty thermostat, or a failing coolant fan switch.