Heater moter wont stop when trucks shut off.replaced the control pannel on dash but no change

I have 2006 gmc sierra 1500 4x4 one day i lost my fan speeds one speed went out then another then another with in a week, i dont know if this is the same issue but its the i think called heater control module controls the blower speeds over time condensation builds up on it causing it to shorten out mine started smoking its on the passenger side under the glove box, you got to remove the long foot/cover i think it only had like 3 screws holding it on and it pops off under your dashboard/glove box then locate your blower and you will see a small plastic rectangle 1"x2" cover insert with a i think 4 wire plug connected to it. it has 2 screws holding this in right next to your heater/ac blower motor they go bad eventually you will loose your blower controls if this is the same issue.. also it is a recall but i dont know the service number i took mine to koons cheverlet

The thermostat that controls the blower might need replacement.