Had my 2004 Trailblazer dead in the driveway with transmission issues. Got it all fixed, everything runs fine, but the climate controls don't change flow paths; mine is stuck blowing from the vents. It won't change to floor or defrost. Other similar threads pointed to a bad actuator, but I can't see the actuator going teats up because battery power was removed and reattached due to replacing the battery. I'll be checking fuses 36, 39, and 44. Heat Ventilation Air Conditioning B, Heat Ventilation Air Conditioning 1, and Heat Ventilation Air Conditioning; respectively.