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There would be two relay's , one for front an one for the back . And the relay would be for high speed only . And it just so happens there are two AUX blower motor relay's . Auxiliary Blower Motor RelayC403
Left rear corner of vehicle, above wheelwell Auxiliary High Blower Motor RelayC404
Left rear corner of vehicle, above wheelwell
Front blower motor relay - K73 top left , Six relay's at top left .
More often than not, the Blower Motor Resistor would be at fault. It controls the speed of the Blower Motor by varying its speed revolutions. The Blower Motor Resistor is located under the hood under the heater hoses. You can purchase one from E-bay, Amazon, or check your local Auto Parts store(try to get the best price). To get an idea of where the Blower Motor Resistor is situated and what it would take to replace it, go to www.youtube.com. Type ......how to replace blower motor resistor ford crown vic.... and the video will pop up. There should be another video under it with the caption.....2003 ford crown
Victoria blower motor resistor swap... Watch both videos as they contain two different approaches in replacing the unit.
On top of the blower motor where the electric wires are, you should see a plug end! unplug that wire plug, and you will have 2 smaall 1/4 inch screws ( 1 on each side of the prongs)! remove the 2 screws, and then remove that plate (the resistors will be on the inside of that plate.
Check for battery power and ground at the blower motor connector. If power and ground are both present, replace the blower motor. If not, you will have to trace the blower circuits, including the blower motor resistor. (second most likely cause)
If the blower work on the highest setting, you have a bad resistor. If the blower will not work at all bang the blower motor with your hand. If it fails to work, then replace the blower motor.
www.walters1975.com
Heater Blower Motor and Blower Motor Wheel Assembly
Removal
Disengage instrument panel insulator (046A24) from instrument panel reinforcement (04545) and remove from instrument panel (04320) .
Disconnect blower electrical connector.
Remove three blower motor mounting plate screws.
Remove blower motor (19805) from A/C evaporator housing.
If the blower motor not blowing,and it is on high, bump the lower motor to see if it will try and start working again,if it does,replace the blower motor.If it does not,then replace the blower relay.If this only happens on the lower speeds,replace the blower motor resister,witch is mounted very near the blower motor in the blower box,with two screws,and about 7 wires going to it.
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