Heating/Cooling System Output problems..

This started in the summer as an AC issue where the system would light up when turned to AC and i could even feel/hear the compresser power up, but nothing would blow out of the fans. Wasnt really a big deal because the AC just eats into my already horrible MPG. NOW its turned into an issue where I turn the heat on and nothing happens. BUT Thumping on the dash will turn the heat on at a very reduced fan output.

So im thinking loose wire....but i have no clue how the wiring for the heat/AC system runs.

Has ANYONE had this type of issue with their X? Does anyone have any insight?

Thanks in advance.

2005 X