1990 XJ6 air not working :(

Hi, i was wonding if someone knew how i could get my air to work, i replaced the blowerin the drivers side with a working one, and found out that the one i took out was working as well, so i also changed the one on the passengers side, but it still isn't blowing out as it should, i can feel the air trying to come out a little.... any ideas ?
 
 Thanks
        Any help would be appreciated.

it's probably the Darlinton transistor in the circuit board near the blower case that you replaced. It's a known issue. Start by clicking on the following link, then scroll halfway down the page to the "1987-on..."  section.
 
http://www.jag-lovers.com/books/xj-s/14-Aircon.html