This is for manual heater system. If you have electronic (digital display) you don't have one. Instead you have a blower motor speed controller.
here is info
Control System Outputs—Manual A/C
Blower Motor Switch Resistor
The heater blower motor switch resistor has the following features:
SOURCE: locating heater blower motor resistor
the resistor is behind your glove box. open the box and push in the sides to release it and let it hang down...the resistor is right there. I didn't try to replace it, a friend did it, but the part was under $20.
SOURCE: Location of blower motor switch resistor on 2004 Grand Marquis
The blower speed controller is located under the hood on the right or passenger side on the heater housing just to the side of the heater hoses near the very back of the right cylinder head.
Yes that would cause the concern you are having.
SOURCE: location of blower motor switch resistor on 2004 Grand Marquis
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SOURCE: My 2004 grand marquis blower motor runs only on
Its under the hood, just to the right and down of where the heater hoses connect on the firewall. It will have 4 wires going to it.
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