Your saying the blower motor runs all the time? I need year--make--model?
If there is a relay for the blower motor and the load side of relay is stuck in the closed position and the fuse for that circuit is hot all the time, the blower motor will run all the time.
The control side of relay needs voltage and ground, if both are present with key off, the relay will energize and the blower motor will run. On the control side of relay with key off, you should be missing either voltage or ground.
A/C - Heater blower motor ! What make , model and year vehicle ? Manual or automatic climate control ? Could be a bad blower motor control module , a high blow relay contacts stuck closed .
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