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Blower motor started acting up a few weeks ago. You would go to turn it on and nothing. We could unplug it and plug it back in and it would work fine. We had voltage at the plug with no visible signs of plug damage when the problem presented itself. Finally decided to change out the blower motor, and that was the ticket. The new one blows twice the speed of the old one.
Blower motor started acting up a few weeks ago. You would go to turn it on and nothing. We could unplug it and plug it back in and it would work fine. We had voltage at the plug with no visible signs of plug damage when the problem presented itself. Finally decided to change out the blower motor, and that was the ticket. The new one blows twice the speed of the old one.
This is usually a sign that the brushes/commutator in the motor have worn out.
First, Load Test the Circuit to determine is you are getting B(+) Voltage without a drop by load testing with a 1-OHM Resistor. A drop of 0.5v indicates a problem in the Circuit. Next, use a Chassis Ground to determine if it's in the (+) or (-) side of the Circuit. If it drops, it's the (+), if it doesn't, it's the (-).
Next: If the Circuit is good, With the accurate number from "First" note the load drop of the Blower Motor. Greater than 0.5v, replace the Motor.
I did mine back in August, 2020. The wheel had separated from the motor shaft. Not a bad job. I’ll include pics showing the failure and the new Motorcraft wheel and motor. Can’t recall the prices though. Failure of wheel. Using a socket to press the locking washer onto the shaft. Wheel attached to motor shaft.
