Envoy blower motor will not turn off. Turn car off, motor keeps running. No response from switch. Had to pull fuse to prevent battery drain

any thoughts ?

You didn't mention your model year or whether you have automatic or manual A/C. In any event, if you have Automatic A/C, you need a new blower motor control module. If it is Manual A/C, you need a new blower motor resistor.

Put the appropriate part in the search box above and you will get full info on replacement instructions. Cheap and easy fix.

C.B.