i have a 95 blazer were the air only blows out of the defroster and bottom vents. ive checked every thing and replaced everything. the last thing i did, but should have been the first thing i did was check the vacuum from the engine. there was none!! does any body no what would cause this. its a 95 blazer with the fuel injected vortec engine.

Other than the a/c problem does it run good? You may have a vacuum leak, and not notice it. (I had a vacuum leak on the vacuum reserve canister and I didnt even notice it.) If you dont find any vacuum leaks check the vacuum hoses going to the control head-a/c.

Good Luck

Where and How did you check vaccum?? if the engine is running its making vaccum! Did you check your vaccum tank and make sure the line is plugged in?