The throttle body needs to be cleaned, grime in this area prevents the throttle plate from closing completely and allowing air to enter, making the air/fuel mixture lean. Make sure to clean the front and back sides of the throttle body. Also, disconnect the battery during the cleaning process to allow the computer to reset and relearn to the cleaned throttle body.
SOURCE: 2002 Trailblazer blower not working
The blower motor resistor card is located under the glove box. You have to take the bottom panel from underneath the glove box out(be careful not to break the wire clip that holds the wires in place on that panel). Once you take the panel loose look in the back. You will see the blower motor. Behind the blower motor is the card. You will need a 9/32 for the panel and a 7/32 for the card. It is only 4 screws total to remove and 2 wire harness clips. It is about a 15 minute job. Good luck and hope this helps. Auto Zone has the part for around $15.00 and will have the step by step instrutions for you also if you need it free of charge. I think the dealer charges $109.00 for this repair.
SOURCE: 2003 Chevy Trailblazer - Rear Heat/AC Controls Don't Work
Sorry, I don't have an answer, but have the same problem. Did you ever figure out what was wrong?
SOURCE: 2002Chevy trailblazer engine cuts off when heater & ac is on
remove the airintake boot and clean throttle butterfly with a rag and carb cleaner
SOURCE: I have a 2001 Chevy
Replace the blower motor resistor. Remove the shroud below glove box, 2 screws and a snap-pop fitting. Be careful of the courtesy light. Remove the blower moter and disconnect the purple/black power connector to it - - you'll need this extra room to work with. 2 more screws, same size, 6.5mm on mine, 7or 8mm on some others, that holds the blower motor resistor in place. This replacement part is less than 40 bones at most parts store. Unplug, replace, re-install, test and you're on your way with about 2 hours of slow paced effort in your own driveway. Typical cost at a garage - up to $400, what a sham.
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