I just happened across your question right after reading an electonic troubleshooting site i like to browse. Here's a link to an article I'm sure will be of much help to you. TrailBlazer Blower Inop
SOURCE: cabin blower fan not blowing air fuses good, a/c good
hello,seems your blower regulator or resistor is defective,hoping your blower motor is not stuck-up,ty
SOURCE: AC BLOWER NOT BLOWING
The resistor that controls the blower motor. it is a small gadget that has a 2 or 3 wire plug . Replacing the resistor should fix your problem. It is on or near the blower motor. Under the dash. Not easy to remove . But it can be. Please give thumbs up if helped.
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