My 1993 Chevy G20 van stop blowing air from vents

the heater control valve might be broken or plugged

I would recheck to make sure that control switches are hooked up. other than that you could check to make sure your air ducts are connected.

Check the fuel pump fuse on the fuse block first because the fuel pump is located inside the fuel tank. It is the 20a (yellow) just above the fuse puller.

Check blower motor. Compressor is doing its cold air work but you need the blower fan to get it into your can/van. You could simply have a loose connection. Follow the wires and try unplugging it and pluggin' it back in. Could also be a fuse or relay. When you say you slammed the door, sounds like a loose connection. Any wires hot or being pinched? See anything thing that looks melted under there?
Also, are you hoses connected to your vents under the dash???? That is easy enough to unscrew and check. Good luck

I think 1995 was the change over year to R-134a. Your car should have R-12. If it has small threaded acme fittings its R-12. The R-134 fittings are different sizes and have snap lock fittings similar to an air hose.

check the fuse by the driver door it should be blue or green

Behind the dash, when you throw the lever to change which vents you want air to come through, it can sometimes "slip" over little plastic gears/levers which flip the ductwork to different vents such as floor to the dash vents or defrost. look up from under the dash to see if the vent control switch is actually moving anything underthere.

93 is made to be mated to a fuel injected model with ecm that controls tranny,84 is still old school! best bet have old 1 rebuilt!

I just had the same problem. If it is a regular van try under the driver seat in a plastic box. If it is a conversion van try in a pannel just behind driver seat on side of van wall behind a pannel that looks like a vent.

hardest part is to remember how to rout the belt theres a place u can put a 1/2 inch or 3/8 ratchet on the tensior to make the belt slide offf