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What CONTROLs A/C-Htr air direction between Defrost/Floor/Cab, elect valves??? on 2003 Dodge Ram 1500

A/C-Htr air vents ONLY blow straight into cab regardless of control switch setting; will NOT blow UP (Defrost) nor DWN (Floor) directions at all!

Asked by for the 2003 Dodge Ram 1500
THEY ARE BLEND DOORS THAT CONTROL THIS. HAVE IT DIAG DUE TO THERE ARE 3 AND A FRESH AIR DOOR.
THX; IF 'blend drs' are elect control VALVES, can a FUSE be the possible problem???
not normally its the actuator most of the time
BIG THX, globalhelper, good to know info! Bottomline - I reckon they will have to rip out the dash to get to the root of the problem.
not always 3 are acessed easy and the other is like a 5 hour job. u just have to know which one it is, hope this helps