blower motor resistor test

Here are some of the warning signs 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.

How many ohms should a blower motor resistor have?

According to the service manual, it must be around 4-5 ohms. In our case the ohmmeter shows open circuit, which means the resistor has failed. Sometimes, a blower motor resistor might fail due to problems with the blower motor itself.

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.

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.

Can a bad blower motor resistor cause no heat?

Problems with Your Blower Motor or Blower Motor Resistor

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.

Why does my blower motor resistor keeps melting?

What causes heater resistors to burn out? Trent, one of the biggest reasons for blower motor resistors to have shorten life is actually because of faulty blower motor drawing too many amps, some times melting wires/plugs, heating up resistors shortening their life.

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.

What are the symptoms of a bad blower motor?

What Are Signs Your Blower Motor Needs to Be Replaced?
Poor or Airflow from Air Vents. This will be the first and most obvious sign your blower motor has a problem. No Airflow At All From Vents. Skyrocketing Energy Bills. Strange Noises When You Turn on the Heat. Overheating Blower / Weird Smells.

Is there a fuse for the blower motor?

Fuse Protection

To protect the blower motor power circuit, a 20-, 25- or 30-amp fuse is usually located in the fuse panel under the dash. The rating of the fuse will depend on the vehicle application and how much power the blower motor requires at full speed.

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.

Should I replace blower motor and resistor?

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.

Are all blower motor resistors the same?

Blower motor resistors have several resistors with different resistances.

When should I replace my blower motor resistor?

If there is no air pressure blowing from the vents, then your blower motor resistor needs to be replaced in order to start working again. Usually, overheating is the cause to a failed blower motor resistor.

How do I test a resistor with a multimeter?

Pick out a random resistor and set the multimeter to the 20kΩ setting. Then hold the probes against the resistor legs with the same amount of pressure you when pressing a key on a keyboard. The meter will read one of three things, 0.00, 1, or the actual resistor value.

How many volts should a blower motor receive?

If power is getting to the blower motor, you should see 120 volts displayed on your voltage meter. If you see 120 volts on your meter, but your blower motor hasn’t been starting, then it’s very likely your blower motor is the culprit.

What can cause a blower motor to stop 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.

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