my heater and my air condition has stopped working
Switch or fan motor. Check for power at the motor, if it's there it's not the switch.
Check the resistor block it is located in the firewall on passenger side. Also could be blower motor. Also located on passenger side
Lately, I've seen a lot of faulty fan motors working yet drawing enough amperage to fry the switch and connector. The resistor block will cause the fan to blow on High only since it bypasses the block and supplies power directly to the motor from the switch.
Looking for a Used Grand Marquis in your area?
CarGurus has 1,239 nationwide Grand Marquis listings starting at $1,799.
Search Mercury Grand Marquis Questions
Mercury Grand Marquis Experts
Related Models For Sale