Wanting to remove A/C from 74 duster

We just pulled all the a/c stuff from under the dash of our '74 Duster but we pulled the heater core and hoses also since we are in Fl. There was some weight to be saved under the dash between the heater core and the condenser. We decided to put the empty boxes back under the dash to make sure we get at least some vent air and defrost. For your purposes I suggest you just remvove the condenser and reinstall the boxes so you don't have a problem. This probably doesn't answer your question but this is what we did. There are a bunch of vacume hoses activating the various doors down there and all we decided to keep was the one that diverts air to the defrost. Someone with more experience I am sure will post shortly. Good luck..