What should the Ohms be on a blower motor?
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.
How do you test a blower motor resistance?
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.
How do you know if your blower motor is bad?
You might also hear ongoing whirring noises, or noises that change or get louder if you increase the fan speed. These are all signs of problems with the blower motor. In some cases, you may even notice smoke or smells of burning while driving, in which case you should pull over immediately.
Why does my blower motor resistor keeps going bad?
What causes a blower motor resistor to fail. By it’s very nature, resistors resist the flow of electricity, much like a flow restrictor in a pipe. However, as a side effect of reducing current flow, resistors generate heat. Over time, that heat can cause the resistor to fail naturally.
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.
How many amps should a blower motor draw?
Up to 20 Amps or more. Amperage is how much power a device is consuming. The Amps will be labeled on the motor’s name tag.
How do I know if I need a blower motor or a resistor?
Typically, if the fan will work on some speeds but not on others, the resistor is suspect. Okay, let’s say there’s no melting going on, but your fan doesn’t work on all speeds. Typically, if the fan will work on some speeds but not on others, the resistor is suspect.
Do blower motors get weak?
Weak airflow is a sign of blower motor failure. This part wears out eventually, meaning its fans can no longer push adequate amount of air out the vents or through window defrosters.
Why does my blower motor work sometimes?
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. When the resistor is working, it reduces the amount of voltage going to the lower fan speeds so the fan runs slower.