i think someone has vac. lines wrong The problem is the engine loses vacuum when you accelerate. Vacuum is what operates the doors that control air flow through your ducts. I had the same problem with my 1998 Ram when it was new. They ended up putting what amounted to a one way valve in the vacuum line. I have owned four of this body series Ram trucks and they all have done the same thing brand new. Its not a big deal, but the previous answer is the best and easiest remedy that can be done. Be careful if taking it somewhere to have it installed for you, it takes a mechanic who doesn't know what they are doing only a half an hour.
When there is a problem in the vent system it defaults to defrost setting. Check the doors & vac supply
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.
If you have all of those symptoms, it sounds like selector on front dash is all shorting out, or your PMC module is acting up sending all different singles.
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