2002 Dodge Ram 1500 Q&A

2002 Dodge Ram 1500 Question: when i turn on the heat,i get warm air from the dash but the air at floor level,

i recently had a new heater core installed at the dealer about a month ago,this problem just occured yesterday,what is the likely causes -
Answer 1
'but the air at floor level,'....what? could you complete the question? And would it still be under warranty?More specific and complete details of problem will help get a better answer. -