What Does A Blower Motor Resistor Do

August 31, 2024 Post a Comment

What does a blower motor resistor do

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.

How do you know if your blower motor resistor is bad?

Here are some common signs that your vehicle's blower motor resistor is bad:

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.

Why do blower motors need resistors?

Blower resistors are resistors which are used to control the fan speed of automotive blowers. The fan speed can be changed either by switching the blower resistor resistance mechanically using a rotating lever, or electronically by the air conditioning system.

What does the heater blower motor resistor do?

The blower motor resistor in your car is the part that is responsible for pushing air through the vents when using the air conditioner or heater. The blower motor resistor is constantly put under stress which can cause it to eventually fail.

How do I test a blower motor resistor?

Together make sure we have continuity. So we're going to check between this terminal. And the

Should I replace both blower motor and resistor?

The heater blower motor resistor can often go bad because of a bad heater fan, and therefore you often have to replace both the heater blower resistor and the fan.

Is there a fuse for blower resistor?

A fuse is often located on the resistor board. The fuse only protects the low and medium blower speeds. High speed will still work if the resistor fuse is blown.

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.

Is it easy to replace a blower motor resistor?

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 are the symptoms of a bad blower motor?

Here are 4 common symptoms of a bad blower motor:

Low/no airflow from vents. The classic sign of a bad blower motor is restricted airflow coming from your air vents.
Strange sounds coming from blower. ...
Circuit breaker keeps tripping. ...
Hot/burning smell coming from air vents.

Can a bad blower motor cause no heat?

Problems with Your Blower Motor or Blower Motor Resistor Without it, there's no circulation of air—hot, cold, or otherwise. The blower motor resistor is the part that controls the fan speed of the blower motor. Both of these components can fail, resulting in the heating system simply not working.

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 do I know if my blower motor fuse is blown?

How to check the blower motor fuse? With the fuse box located and the blower, motor fuse identified, go ahead and remove it and check the filament. If it's broken, the fuse is blown. Replacing the fuse may solve the problem or you may find it blows again either immediately or shortly thereafter.

Why does my blower motor only work when I hit it?

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.

Does blower motor affect engine?

Without a functioning blower motor your engine runs the risk of overheating. If you hear that the blower motor is operating but don't feel any air flowing through the vents, the problem is with the airflow controls [source: RepairPal].

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

5 mins. If you have the tools, the replacement part, the skills & the unit is already disassembled.

How do I reset my blower motor?

Follow these simple steps: First, turn off the power supply to the furnace by turning off the breaker in the circuit box. 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.

How do you reset a 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).

Where is blower motor relay located?

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. A failed blower motor switch can also give many of the same symptoms.