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.
This is the same on all cars. When the air flow is OFF in a section, the it blows stronger to the other vents. In this case the ones for the windshield. This makes defrosting quicker so you can start driving safely sooner.
Check the blend door actuator.
Check for vacuum leak either under dash or hood Check for bad vacuum motor under dash Defrost is the default setting for this vehicle
why dont bottom vent doors not open on 2001 gmcsonoma
Heater Core is the likely culprit
You will need to replace the rear expansion block valve and the recharge the system with freon and oil..............
Air vent. It blows under front seat and into back.
no heat to front window went defrost is on
sounds like the vent door that changes the air from defrost to heater is jamed its a little metel door like a flap.follow the cable from defroster switch and you should be at the door,its a manual door
Check for vacuum leak either under hood or under dash Check for bad vacuum actuator under dash Check for bad selector switch in dash
Your blend door is giving you trouble, it is not switching from defrost to heat or vent