Were is the heater motor and blower at on a 1998 Mercury Sable LS?
The heater motor and blower assembly on a 1998 Mercury Sable LS is located behind the dashboard, on the passenger side. It's usually accessed by removing parts of the dashboard and/or glove compartment. This is a fairly involved process requiring some mechanical aptitude. You'll likely need to consult a repair manual specific to your 1998 Mercury Sable LS to get detailed instructions on how to access it. A Haynes or Chilton manual would be a good place to start.