a switchor the the relay to the fan is blown open. take a tester start at the blower and test back wards. If all fails put a kill switch on the battery.as a quick fix. But each time you restart your coputer has to reset it might run rough for 10 miles/min. and u have to fix your clock & raido stations. If you mean the heater fan i think its a purple wire to the fan is hot.
battery
under right side dash, near blower fan. has two screws & connector.
Are there issues with the electronics?
The blower motor resistor on a 2000 Ford Expedition with a 4.6L engine is located under the dashboard, on the passenger side, typically near the blower motor itself. To access it, you may need to remove the lower dash panel and possibly the glove compartment. The resistor is often mounted to the HVAC housing and is connected by a wiring harness.
You might try adding water to the engine. That is what was wrong with mine.
I tested mine by putting wires with alligator clips on the blower's terminals and touched the other ends to my battery.
Did you by any chance make a spark removing that battery? If you did or didnt I suggest you check the fuse
find blower motor check for voltage on one of the three pins at blower motor, if so check for good grd. most likely ur blower motor is fualty.
To replace the blower motor in a 2000 Oldsmobile Intrigue, first disconnect the negative battery cable. Remove the passenger side under-dash panel to access the blower motor, which is located near the firewall. Disconnect the wiring harness and remove the blower motor by unscrewing the retaining screws. Install the new blower motor by reversing the process, ensuring all connections are secure before reattaching the under-dash panel and reconnecting the battery.
Possible bad alternator.
Motorcraft BXT - 65 - 650 according to the 2000 Ford Expedition owners manual ( Ford also has cheaper batteries available )
The relay is right behind the battery. The lead got bumped off when removing the battery to get access to the blower motor.