2006 P71 Blower motor won't shut off

[Cougar]

@Mustangman makes a good point about the relay contacts being shorted, that is a possibility. I suspect there is another cause for the issue, especially if your car has a variable speed control for the blower. I think it does. If that is correct that means there is a solid state speed controller in series with the blower motor power. The transistorized module can fail in two ways, either open or shorted. In your case it would be shorted, power is then passed through the module and to the motor. Power is provided to the motor at all times. The module will be connected to the motor and fastened to the air duct for cooling.