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Q:

AC AND HEATER FAN NOT WORKING on 2005 Mercury Grand Marquis

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
DOES NOT WORK ON AC OR HEAT
(1) Answer
Most likely it is the blower resistor. I have a 2005 Grand Marquis, the resistor has went out twice. It is recommended not to run the fan on the lowest speed as the fan is used to cool the resistor.