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Most likely the "low" speed section of the blower motor resistor is open. Unless you have the automatic A/C/heat control, the resistor will cost you 20 or 25 dollars.
blower resistor especially if its chrysler/jeep or blower switch
Its on the fire wall in motor compartment rt next to blower motor. Easy to change ! Five min. Job.
Could be a bad blower motor, or, look to the blower motor resistor mounted on the engine firewall on the passenger side near the top of the firewall inside the engine compartment. It will have five wires going to it. It is likely either burnt out, or the wires have shorted at or near the resistor.
Inside the cab. Passenger side. Inspect the heater ducts Look for five wires going to the resistor. Should be two screws holding it in.
If you are referring to the blower motor speed control, and you only have one speed, then the blower motor resistor pack is defective and must be replaced.
from the bottom!
It is under the glove box. Take off the big black cover below the glove box by removing the two plastic tabs (tough to get out, used a screw driver to pull out slightly and then stuck needle nose pliers underneath to remove the remainder). The Resistor is in the back left corner within the duct. 2 screws and the resistor pulls out. My resistor had a big corrosion bludge that slowly ate away at the 1-3 speed paths on the plate.
The heater resistor on a 94 Astro is located on the top of the heater box under the hood, it has a four or five wire plug on it and two 6mm screws hold it in a hole in the heater blower box.
On a 2006 Ford Five Hundred , 3.0 litre V6 engine : firewall 1-----2-----3 4-----5-----6 front of vehicle > driver
Look to the blower motor resistor mounted on the engine firewall on the passenger side near the top of the firewall inside the engine compartment. It will have five wires going to it. It is likely either burnt out, or the wires have shorted at or near the resistor.
1-----2-----3 4-----5-----6 front of Ford Five Hundred