I was having the same issue with my vehicle today and it turned out to be my blower motor resistor.
The blower motor is mounted under the glove box. It is in the corner somewhat covered by the kick panel. The card, at least on my vehicle, is held in with 2 phillips head screws. The plug has 4 wires, one large wire and 3 smaller wires.
Here goes a picture.
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Thursday, August 12th, 2010 AT 7:54 PM