Air condition blower doesnt work in 2003 mercury grand marquis

SOURCE: the blower for my 2003

Hello, This is usually the blower motor Resistor when this problem occurs. To locate this part you can find your blower motor under the hood in the Firewall ductwork. Then follow the wires from the blower motor across the Firewall to about the center of the body. There will be an Electric connection and a part secured by 2 boltheads. The majority of this part is hidden inside the Firewall.

Sometimes you can tap the connector and the part will work again. If it still does not work you will need a replacement. The heater pipe runs next to this part and the hose at the back of the Intake manifold will get in the way. It is best to work on a cold engine as most of the antifreeze will stay in the engine when the hose is disconnected. It will also help to remove the mounting bolts and connector before you remove the heater hose and have the new part close by. Then you can swap out the parts single-handed and reconnect the heater hose without ever turning loose of the heater hose.

The Digital controls on the A/C panel can be put in a Diagnostic mode. There is a Code book and sequence to initiate the mode. It can vary depending on the Year and chip-maker. A Technician could easily run the code for you in 5 minutes. It is most useful when the duct-work door actuators are bad.

The part you are seeking is about the size of a pack of cigarettes and can run from $40 used to $150 new. I hope my solution has been very helpful to you.