The blower motor on my 2002 Pontiac Grand Prix GT stayed running after I shut off the ignition then restarted car and it quit working altogther Is motor?

It's *likely* the blower motor resistor, but it could also be the blower motor itself, or even a wiring issue. The fact that it ran continuously after turning off the ignition points strongly towards a resistor problem. The resistor controls the fan speed; when it fails, it can sometimes cause the fan to run constantly at full speed. When that fails completely, the fan stops working.

Here's a breakdown of why it's likely the resistor, and what to consider:

* Blower Motor Resistor: This is the most common culprit. It regulates the voltage to the blower motor, allowing for different fan speeds. Failure often leads to the fan running constantly (at its highest speed, bypassing the resistor's control) or not running at all.

* Blower Motor: It's possible the motor itself has failed, though less likely given the initial continuous running. A completely failed motor wouldn't run at all, regardless of the resistor.

* Wiring/Fuse/Relay: A short circuit in the wiring, a blown fuse, or a failed relay could also cause the problem. These are less likely, but possible.

What to do:

1. Check the fuses: Locate the fuse box (usually under the hood or in the passenger compartment) and check the fuse related to the blower motor. Replace it if it's blown.

2. Locate the blower motor resistor: This is usually located behind the glove box or under the dash, depending on your specific model. You'll likely need to remove some trim panels to access it. Check for burnt or damaged components.

3. Test the blower motor (if you can access it): If you can access the motor itself (often requires more disassembly), you can attempt to test it with a multimeter to see if it's receiving power and if it functions. However, this is more advanced and requires some electrical knowledge.

4. Consult a repair manual: A repair manual specific to your 2002 Pontiac Grand Prix GT will provide diagrams and instructions on locating the components and performing tests.

Recommendation:

Start with checking the fuse and then the blower motor resistor. Replacing the resistor is a relatively inexpensive and straightforward repair (often under $30 for the part) and is the most probable solution based on your description. If replacing the resistor doesn't fix the problem, then further diagnostics are needed to determine if it's the motor or a wiring issue. Consider taking it to a mechanic if you're not comfortable working on your car's electrical system.