To find it, you'll likely need to:
1. Remove the glove box: This usually involves unscrewing a few screws and possibly disconnecting a light or other components. Consult your owner's manual for specifics.
2. Look behind the glove box: Once the glove box is out, you should see a small electrical component, often a black rectangular box, with multiple wires attached. This is likely the blower motor resistor.
If you can't find it there, it's possible it's located in a slightly different position within the dashboard area. A detailed diagram in a repair manual specific to your 1999 Ford Econoline 250 would be helpful for precise location. You can usually find these online or at auto parts stores.
