Where is the resistor block on a 2003 mercury grand marquis?

The resistor block on a 2003 Mercury Grand Marquis is typically located behind the passenger side dashboard, near the blower motor. To access it, you may need to remove the glove compartment and some paneling. The resistor block is responsible for controlling the speed of the blower motor in the heating and air conditioning system. Be sure to disconnect the battery before attempting any repairs for safety.