I have a 2005 impala with a 3.4 V-6. The hvac blower motor will not stop running, even with the car turned off. The only way I can stop it is to pull the 30amp fuse from under the hood. Any suggestions?

Check the relay for it maybe it failed in the on position or energized.

The switch in the cab just contols the relay in the circuit

By HVAC blower motor, do you mean the air conditioner's condenser fan motor?

If I read this right he is having the same problem I am. Its not the condenser, it's the blower the blows the air into the car. Under the dash on the passangers side. It won't shut off even when the car is off.