Without testing a guess would be a blend door or actuator or maybe a control problem
the control cable probably came off the connector
2003 crown vic air conditioning vent dont blow
Check for a vacuum leak -sounds like it is starving for vacuum and reverts to the default position
Your heater core has failed.
Your front blower motor has gone out. There is a front and a rear blower motor.
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.
I have the exact same problem, did you ever get an answer?
My ac blows fine through the overhead, floor and side vents but intermittentely throught the front vents. What might be the cause?
If it blows only out the defroster vents : then check for Vaccume leak Rick ASE L-1 Master TransMichigan.com
There may be several reasons why the air only blows out the front vents and not on the floor or the defrost on the 2003 Dodge Ram. The fuses may be blown, or the heating coil is not working correctly.
1st bet: Does it smell like antifreeze? Leaky heater core. 2nd bet: Worse after rain or car wash? Leak under cowl vents (the vents in front of the windshield. Good luck!
Romeo - 2003 Blowing Up was released on: USA: 2004