Chosen Solution
I have a 2000 licoln town car signature series and about a year or two ago I had the heater core replaced but now at the wrong time off the year the heat don’t come on the display comes on and adjust and does it’s stuff properly but for some reason the heat dosent work, I have check the fuse under the driver side fuse box inside the car at the EACT Blow motor fuse and it fine.
I found out it is in the dispay unit a wire that controlled the motor had shorted out but allowed the display to continue to work so I wired a switch to the blower motor and ran it inside the car with it hooked straight to the battery and the blower and put a fusable link in the wire and it works
Have you looked at blower resistor relay board? with the fan not blowing, it points me more at the relay board or the blower motor. Here is a youtube video of someone replacing it on a 2002. https://youtu.be/KxPuEg9EsbI
