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Question edited for clarity, 'year make model' should be first as it is the most important piece of information and allows the site scipts to suggest the category.
Question moved from Misc to make model category.
The climate control is controlled from the Body Control Module. You will need an auto electrician with a pro grade scan tool computer to check the data network for the heater controls.
Somewhere you have a direct short. It could be the compressor wiring or the blower motor. Does the fuse blow when you use the heater? If not the look at the wiring that goes to the compressor. Check and make sure that the compressor is not seized. Has there been resent work done to the engine?
Could be ! could also be the blower motor is bad or blower motor control module .
Does you buick have manual or automatic climate control ? There is a fuse box under the rear seat ,that is where fuse is for blower motor .HVAC BLWR fuse 40 amp. Chevy Trailblazer EXT Blower Motor Won Turn Off
What are you using to test this control signal ? Were you on right wire ?
Blower Motor Control Processor
The blower motor control processor is an interface between the HVAC control module and the blower motor. The blower motor speed control, battery positive voltage and ground circuits enable the control processor to operate. The HVAC control module provides a pulse width modulation (PWM) signal to the control processor in order to command the blower motor speed. The processor supplies 12 volts to the blower motor through the blower motor voltage supply circuit. The control processor uses the blower motor ground as a low side control to adjust the blower motor speed.
Chevy Trailblazer EXT Blower Motor Won Turn Off The blower motor in this video don't shut off , but he show's how to test the PWM signal right !
Your blower motor control module is probably bad , or HVAC control panel is bad , or a wiring problem !
Check for loose or dirty connection on battery. If dirty clean with battery terminal cleaner or wire brush. If this is helpful please leave good feedback
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