Where are you looking? American usually puts the dash HVAC stuff in the basement bay under the driver seat. Everything except the compressor, which is back by the engine. I'm not familiar with your 2002 - I had an '04 with a new chassis and body style.
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC