You asked: How do you test a blower motor with a multimeter?

How do you know if your blower motor is bad?

Detailed below are some obvious signs of a bad car blower motor:

  1. FAN BLOWS AT ONLY A CERTAIN SPEED. …
  2. WEAK AIRFLOW OF THE BLOWER MOTOR. …
  3. UNUSUAL NOISES FROM HVAC SYSTEM. …
  4. SMOKE OR SMELL WHEN DRIVING. …
  5. HOW DOES A CAR BLOWER MOTOR WORK?

What voltage should a blower motor be?

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 do I know if it’s the blower motor or the resistor?

Blower Motor Resistor Test

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.

How many ohms should a blower motor 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.

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How do I know if my blower motor has power?

Check for power at the motor itself. Using a test light or a multimeter set on volts, unplug the blower motor. Keeping the black lead on a good ground, usually a bolt on the engine block, and the blower switch turned on, use the red lead to probe the plug that usually attaches to the blower motor.