I have a 69' Dart with a Slant Six, auto trans and original air conditioning.
I converted it so it uses R134a refrigerant and it works great.
Unfortunately it leaks and I have to recharge it (again).
It's been so long I cannot remember which a/c port I use to put the refrigerant in.
Can anyone help me with this?
I've been all over the internet and can't find the answer.
Thanks!

 

low pressure side

 

it leeks cause you have chrysler factory hoses.

 

Which hoses should I be using?

 

there should be aftermarket hoes at your parts house. you might rig a way to test each hose. take it off, seal one end compressed air in the other end with a pressure gauge, hold the air in. if the air stays in the hose it is ok. now i have never done that, so iam just thinking off the top of my head. the compresser is the most likely place for a leak, and check the bolts and seals first. allso the evaporator under the dash might leak, they are a pain to replace. some hoes have a "o" ring on one or both ends, needs a spcel oil to go on the "0", not just any oil. a good parts house will have them. different systems may need a diffrent oil.