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Your front blower motor has gone out. There is a front and a rear blower motor.
2003 crown vic air conditioning vent dont blow
Lack of or absence of maintenance such as oil changes and fluid levels.
Because the air selector died.
some thing is probley cloging the vents take it appart and ckeck.
If it blows only out the defroster vents : then check for Vaccume leak Rick ASE L-1 Master TransMichigan.com
Mercury did not blow up.
If the fan is working but not blowing air out of top vents, It is a vacuum hose. You need to take engine cover off to get to hose.
Either the a/c system is low on freon or the evaporator has an internal restriction....
The blend door actuator may not be working.
The flap that directs sir to the selected vents is jammed or broken...or the switch that controls it is.
First, check for the recall on the blower resistor at recalls.gov or something like that. Second, check the fuse box located below the steering wheel.