Steering is very hard at idle. Improve s when going 40 to 50. Suspect sensor for power steering.
I have a 2006 tc signature with 93000 mi. Suspension was never changed so i assume its still air. Which side is power steering side?As @alumarine asked, we need your model year?
Most all Town Cars have the EVO power steering which uses vehicle speed as the sensor to control the power steering applied pressure. The suspension module controls both the air suspension and the evo steering. When the vehicle is parked and at low speed the power steering has full power. As the speed increases the power steering pressure decreases significantly so the steering feels heavier. It appears that your car has defaulted to no power steering, so as your go faster the steering gets easier because less power steering pressure is needed.
The vehicle speed sensor may differ across model years but the general idea is that it gives off a lower rate signal at low speed and a higher rate signal at high speed (max of 600 at 144 kph). I assume your speedometer is working and depending on model may eliminate that sensor. There is also an actuator that takes the signal from the suspension module (Power steering side) and applies it to varying the pressure, so that could have failed too. Or your power steering pump is not working. With your model year we can come up with the procedures perhaps.
Do you still have air suspension or was it converted to steel springs?
I assume you want to know which of the two connectors on the suspension module is for the power steering? Sorry I don't know. There is an actuator on the pump which opens and closes a valve so look at those wires and check for same colours at the module. The suspension connector will have many more wires for the height sensor, spring solenoids and compressor motor and solenoid, suspension off switch, power, ground, etc.I have a 2006 tc signature with 93000 mi. Suspension was never changed so i assume its still air. Which side is power steering side?