If it blows only out the defroster vents : then check for Vaccume leak Rick ASE L-1 Master TransMichigan.com
Your heater core has failed.
No, the offset is wrong.
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.
replace flaser can in fuse box
no where ur not allowed to get one mike whats wrong with u!!!!!!!!!!!!!!!!!!!!!!!
Without testing a guess would be a blend door or actuator or maybe a control problem
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.
Crankshaft sensor intermittent. Or crankshaft circuit intermittent.
Auto Zone will check your engine light for FREE. They will also tell you whats wrong.
P0601 PCM internal check sum failure. Your engine computer will need replaced.
Check the radiator hose for weakness or it could possibly be the wrong hose.
If the climate control on a 2003 Trailblazer will not switch from feet to head vents, try changing it to defroster then back to head. The mode button on the dual climate control model can only be switched from face/feet to feet and then to defrost. The feet and head vents worked at the same time.