What should the voltage be on a blower motor?

If those are OK than backprobe the blower motor connector and check for power on terminal 1. Check terminal 2 for a variable voltage, this should be 12v with the fan control knob on off and 5v or full ground on full. If that checks out replace the blower motor.

Where are the fuses on a blower motor?

Check fuses 10 & 11 in the underdash fusebox. If those are OK than backprobe the blower motor connector and check for power on terminal 1. Check terminal 2 for a variable voltage, this should be 12v with the fan control knob on off and 5v or full ground on full.

How to test a blower motor with a multimeter?

Take out the car’s blower motor relay. Read the grounded relay with your multimeter (Ohm scale). Then check the current pin while not grounding it to the multimeter’s DC scale.

How is the RPM of a blower calculated?

The blower is used to move a given cubic feet of air per minute through an air conditioning system. Figure 13-2 In the above diagram, (See figure 13-2) the two pulley sizes are known and the rpm of the motor pulley is known. The motor pulley rpm is read from the motor data plate. Using a ratio the blower rpm can be found.

How can I tell if my blower motor is faulty?

This is usually the first indication that you may have a faulty blower motor. If the airflow coming out of the vents is weak, it can mean that your blower motor is having a hard time pushing enough air through the ducts to achieve your desired temperature.