'98 Tahoe 4wd with rear aux air
blower(s) continue to run after the ignition is turned off.
blower switches work (front and rear)
so, if the blower(s) are on and I turn off the ignition, the blower(s) continue.
I can then turn the blowers off using the blower switches (front and rear).
With the ignition OFF, the blower switches are functioning as if the ignition was ON. Speed control (HI/LOW/etc…) of front and rear blower(s) is functioning as if the ignition was ON.
If I forget, the battery will be drained when I return to the truck.
The problem may be due to a faulty ignition switch. The problem may also be due to a faulty relay for the blowers.