it should be close to the fan in the front of the evap case. passanger side firewall engine compartment
it is a 2wheel drive, light duty truck. they quit making them, and replaced it with the Dakota
The resistor motor may have went out if the heater blower quit working on a 2004 F-250 Truck. The cost to replace the motor is approximately $200.
if you can not find it on the passanger side of under truck behind bumper you will have to go to a ford dealer and order a cord for it they quit putting cords on all the trucks around that time but the heater is in the block on all of them. some dealers did not spec the truck with the winter packege.
If by quit working you mean quit blowing, the things to troubleshoot are the blower motor, the blower motor resistor switch, or the blower motor speed selector switch. If by quit working you mean it only blows cold or warm air, the thermostat is probably stuck in the open position.
The diverter, or blend, door, is not working properly, The door is either feeding the heat through the defroster, or closing the heat completely off.
Check your fuse
because it broke.
As of 2013, no.
When you have the heater on, does it just blow any air at all? or no air?
after the 96 model year dodge quit using them
A more detailed explanation of the symptoms would have to be given in order for a determination to be made. As is, the question leaves us no indication of whether it's not blowing air period, or it it's blowing hot air, or what it's doing exactly.