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Why does the blower/fan for heater and air conditioner work sporadically?

(2006 Toyota Corolla)
in Albuquerque, NM on May 31, 2012
Car only has 45,000 miles, have had this problem for a year. Dealer said it needs a new motor ($600) not covered by warranty. If it's the motor then why does it work about half the time. I've discovered that when it refuses to work, if I open and shut the glove compartment with a little force, it will sometimes work. What's up with that? Electrical problem?
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Popular Answer
on May 31, 2012
Its a bad winding in the actual motor itself. Electric motors work with magnetics. Electrical current flowing through windings inside the motor build up a magnetic field in the shaft and the stator. attracting polarities cause the shaft to rotate. When there is a bad winding, part of the magnetic field doesnt get fully fielded. Thus causing it to sometimes work and sometimes not.
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