In my 68 Chevelle - Air flow with the air conditioning. It don't blow...it sucks. It has good cold air but air flow is not like I am now use too with these modern systems. Just had a relay put in the line to the fan motor - that helped the fan speed at lot at lower engine speed - changed out the squirrel cage to a light weight plastic with a 325 ( I think ) CFM unit. Helped as well but more puff is needed. Got any ideas. A 600 or up CFM would be good but it is a small box and I am not really into major dollar a/c redos. But I am open to anything. It is factory with an upgraded compressor. Seems mainly just poor air speed.
First check that all of the ductwork is intact and sealed tight. All of the foam seals where the ducts fit together and where they fit into the heater box probably need to be replaced--you can use hardware store weatherstrip to do this. Turn the fan on full speed and feel around the ducts & box for air leaks. Also make sure that the doors are opening fully and that the vacuum pods aren't bad. You might also check to be sure the fan is spinning the right direction--if it's not wired right or if you have the wrong squirrel cage on it, the air flow will be diminished.
BL
