I am trying to get the a/c working in a '76 Monte Carlo. The compressor is working, I bought a kit to convert it to 134, filled it up, and it worked. I even patted myself on the back a little because everything went as planned on the first try..................until the next day when I realized that the refrigerant had leaked out. Now for round two, the hoses look to be in good condition, and I am going to replace all of the o-rings. What other parts should be replaced while I am at it?