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Your post is not making sense. If the blower motor wasn't shutting off, how would replacing it cause anything to change? Clearly, there is a problem with the power supply TO the motor. If you want the motor to turn off, you need to check WHY the power to the motor is not cut off when the switch is turned to the off position. Probably a bad switch. Or it could be the blower motor resistor even, albeit a lot less likely.
replace the blower motor module located under the dash on the passenger side near the blower motor. The module has a constant power supply to the high side relay. if the relay sticks the blower stays on all the time. Replacing the module is the usual fix.
Unplug the relay and see if it shuts off. Or unplug and remove the blower resistor and see if a broken wire on the resistor is causeing a short to power.
It's common for the blower motor speed resistor and harness to melt causing your blower to only work on high and check the blower motor relay. The relay may have melted also causing the 12 Volt power to still be supplied even though the vehicle has been shut off. Good luck and you can but the parts needed at most Auto Parts store like Auto Zone, but i believe the GM parts department has the resistor and wire harness kit to ensure all the parts that may have been damaged due to the heat built up by the current used to run the blower motor on hi. Good luck and keep me posted, be glad to know you have your truck running 100%
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