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Based on the symptoms suggest a progression of failure in the various speeds, I suspect that the blower motor itself is probably OK, and the problem is a failure of the blower "speed control RESISTOR PACK." The speed control resistor pack is usually located on the plenum chamber [the "box" usually located beneath and/or behind the dashboard above the right front passenger's seat floorboard.
What else can I help you with?
Where can you find a Blower Motor Resistor for 2003 Trailblazer I have contacted several parts stores - no one has them in stock and I can't seem to order it?
Go here to order Ac Delco part # 15-80860 blower motor resistor for $14 plus ship and handling http://www.oehq.com/index2.cfm?showpage=utility/partsearch2.cfm GM Dealer only. I got mine from Autozone.com. About $14.00
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