How Does A Blower Motor Resistor Work

November 15, 2024 Post a Comment

How does a blower motor resistor work

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 I know if my blower motor resistor is out?

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.

What causes blower motor resistor failure?

In most cases, the blower fan resistor is failing either due to overheating or corrosion. If the blower fan fails, your car will not blow any forced air. However, sometimes the problem can be with the blower motor itself. This is especially apparent when you have replaced the blower fan multiple times.

How do you test a blower motor resistor module?

If you want to do a quick test of the blower resistor, you can check the resistance of each of the resistors with a multimeter as follows: set the tool to read ohms (a measurement of resistance) and connect one of its probes to the common output terminal of the resistor.

What is the difference between blower motor and blower motor resistor?

The blower motor IS the fan. The blower motor resistor is what allows the fan to work at different speeds as opposed to just off and on.

Does a blower motor resistor have a fuse?

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.

Should you replace blower motor and resistor at the same time?

We do suggest that you replace the resistor at the same time. It may not be critical, but this will keep the system more uniform. The issue may even be related to the resistor. If you know that it is not related to the issue, then you do not have to replace it.

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 long do blower resistors last?

How long should a blower motor resistor last? While a blower motor resistor is built to last for the car's lifespan, you can expect it to last for 10-15 years, but it's possible for them to last longer or shorter depending on the climate, driving habits, and quality of the resistor.

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 diagnose a blower motor problem?

If the blower motor isn't running you should:

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

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.

Is there a fuse for blower motor?

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.

How do you fix a blower motor resistor?

How to Replace a Blower Motor Resistor

Step 1: Remove the glove box door, if necessary.
Step 2: Disconnect the wiring harness and remove screws. ...
Step 3: Remove and replace the blower motor resistor. ...
Step 4: Tighten screws and reattach wiring harness. ...
Step 5: Reinstall the glove box door.

How many ohms should a blower motor resistor have?

How Many Ohms Should A Blower Motor Have? A good blower motor is expected to read over 0.5 Ohms.

Does a blower motor resistor control the fan speed?

The fan speed can be changed by switching the blower resistor resistance mechanically, using a rotating lever, or electronically by the air conditioning system. The blower motor resistor is responsible for controlling the blower motor speed.

Does the blower motor resistor have anything to do with the AC?

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 reset my blower switch?

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).

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.

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.