The blower motor may shut off after only a few seconds due to a malfunction in the motor itself, a problem with the electrical connections, or an issue with the control system. It is important to have the motor inspected by a professional to determine the exact cause of the problem.
Have your blower motor resistor or blower motor checked out
faulty blower module. Under hood not far from blower motor
Ifit has the c68 option (auto air) check the blower control module under the hood
Sounds like blower motor module resistor
Look at the passenger side under the hood. The circular tube like thing is the blower. Unplug the wire from the blower to stop the motor. This will stop the motor, however, will not solve the problem. You may have to check the motor relays.
when my car did this it was a blown fuse
it needs a blower motor control module located under the glove box
When the blower motor stays on it means there is a short to power, or the relay is sticking. 99.9% of the time the relay sticks. I belive on the 2004 silverados the blower motor relay is internal to the blower motor resistor. Try to find an auxillary blower motor relay and if there isn't one then replace the blower motor resistor.
BAD FUSE SOUNDS NUTS BUT IT IS?
Your blower motor working even after the car is off is a good sign. This means that the car's system is preventing your car from overheating.
problem with electrical wires attached to the blower motor , they're to loose, try to paste them again
compressor contactor is bad. probably stuck in the closed position.