How To Test Blower Motor Resistor

October 23, 2024 Post a Comment

How to test blower motor resistor

Signs of a Bad Blower Motor Resistor 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.

How do I know if I need a new blower motor resistor?

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.

Can you test a fan blower resistor?

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.

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.

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.

Can a blower motor resistor be bypassed?

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.

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.

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.

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.

Can you repair blower motor resistor?

The average cost to replace the blower motor resistor at a repair shop is between $44 and $55 in parts and $70 in labor costs, for a total cost of around $114 to $125. What is this? On the other hand, you can easily fix the blower motor resistor at home in about an hour (even if you're a beginner) and for around $70.

How many ohms should a fan motor read?

A good motor should read less than 0.5 ohms. Any value greater 0.5 ohms indicate trouble with the motor.

Can a bad blower motor resistor cause no AC?

If the airflow from the vents is weak… A damaged blower motor resistor will work on one fan speed which may not be enough to keep the inside of your car cool or warm enough.

How can you tell if a resistor is bad?

If the resistor is fine, the multimeter will show its value in Ω, kΩ, or MΩ. However, if the resistor is bad or damaged, the multimeter may display 0 or 1. If the value 0 is displayed, the resistor is damaged, and the current can't pass through.

How do you test a resistor?

One lead from the circuit. It doesn't matter which one next you will want to obtain an electrical

What voltage should a blower motor be?

A blower motor should receive between 12 and 24 volts of power in order to operate properly. If the voltage is too low, the motor will not be able to start or run properly. Too much voltage can damage the motor.

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.

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 long should a blower motor resistor last?

The blower motor resistor is designed to last for the car's lifespan. In most cases, these resistors will wear out long before the car does. Usually, the wear that the blower motor resistor has is due to the constant use that it gets and the heat that it is exposed on a regular basis.

How do you test a blower motor with a multimeter?

Go kit so today we are testing the blower motor. Okay we reuse a multimeter we're gonna check

What does the blower motor resistor connect to?

The traditional blower motor resistor is connected to ground and wired in series with the blower motor assembly. Blower motor resistors have several resistors with different resistances. This controls the current that runs through the blower motor.