1995 Lincoln Town Car fan speed only works on high

It is the blower motor speed resister under the hood passenger side

no good replace it

This is what I have in my books
I went back and looked it up
wiring diagram showing that the blower motor and resister on the fire wall right side

Blower Speed Controller (BSC)

The BSC is located on the evaporator case, near the blower motor. It is accessible from the engine compartment. The controller converts signals from the control module to a variable ground feed to the blower motor. Blower motor speed is controlled by control module and blend door actuator position.
A delay function provides gradual increases or decreases in blower motor speeds. A high-speed blower relay, integral with the blower speed controller, provides maximum airflow in high speed blower position.

I can and try to email it for u

Same year and model?
Was the fuses checked locate the blower motor
disconnect blower motor wiring plug
key on engine running or off
place fan switch at high
check for power and ground at the wire plug
if you have both remove and replace blower motor
if not what is missing
ground suspect bad speed resister if power check fuses, relay, wiring and ignition switch

let me know