1998 Lincoln Town Car Executive ( air conditioning )
When starting the car, some times the air blower will work and some times, will not. At times, a small bump will make it work or stop. The air unit is cold, and have freons. When not working, air blower does not function, the clutch does not engage ( no air comes out ). I checked the fuse -ok---replaced the clutch relay-ok. Is this sign of bad air blower motor ? Any suggestions ?

You need to check the wiring and any connectors associated with the blower.

Sounds like the motor is not failing.