problems with heating / cooling system on 1994 Lexus SC400

several months ago something went wrong with the heating / cooling system in my cars seems as though something may be wrong in the air delivery duct the heating mode, the engine is making hot air but air barely comes out of the duct the a/c mode, cold air comes out of the drivers side dash vent at a reduced rate and the rate of air movement from the rest of the dash vents is even more reduced.

Asked by for the 1994 Lexus SC400
It sounds like your Climate Control System needs to be diagnosis, this system has its own computer and codes. here are some shops