2000 Cadillac El Dorado

I have been having a problem with the Heat/Ac with my 2000 Cadillac Eldorado. The heat and the AC work however very little of each comes out, even on the highest setting. The ac blows cold and air and the Heat blows hot but very little pressure blows out. Any suggestions on what it could be. Is it something I can fix on my own or do I need to take it in?
November 19, 2007.

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