AC Vent Fan only operates at high speed setting on 2003 Honda Accord

My 2003 Honda Odyssey has a variable speed fan. Until last week it was working fine. Now it will only come on when I turn the dial up to full speed. As soon as I back it off from full speed it turns off. It will also come on at full speed when I turn the setting to Auto. Any ideas what went wrong?

by in Revere, MA on April 30, 2013
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2 answers
ANSWER by , April 30, 2013
Most likely is the blower motor power transistor is bad. It's mounted in the HVAC assembly to the left of the blower motor.2 philips screws.
ANSWER by , May 01, 2013
blower motor resistor is bad