You need to find & fix the leak.

 

I did not pull a vacuum ... I used the first can to try and bleed out any air that could be in the line. Could the vent problem be caused by air still in the line?

 

Yeah, that'll cause uneven temperature across the face of the evaporator. Incorrect pressure can cause that too. Try a can with dye so you can find the leak. Or find a shop with a leak detector (sniffer).

After you fix the leak then have it evacuated & filled by weight. That's more accurate than filling by pressure. (But filling by pressure is way more accurate then just guessing) Adding cans of refrigerant & bleeding it out is a real poor way to remove the air. It'll take forever to get all the air out.

 

Air in your system will cause it to run poorly. Air doesn't compress to a liquid like R134a, and it won't bleed out.

Jim is correct, you need to find and fix the leak.

You car is 20 years old, so all of the o-rings are probably brittle. A bad shaft seal is another location for a leak.

What I did was dismantled the system. Replaced all of the o-rings and used Nylog o-ring lubricant to help keep the rings lubricated. I replaced the shaft seal (I can give you more detailed instructions), because I wanted to make sure that I did it right the first time and would not have to repair the a/c for a long time. I also bought a new receiver/drier and expansion valve. I drained all of the oil from the system, and used oil that was made for R134a. Once the system was back together, I pulled a vacuum to remove the air, and waited for an hour to make sure it held a vacuum (it did). Then I added the R134a. It has been working fine since then.

 

Thanks guys ... The air actually started to blow cold out of all of the vents ... but I'll be buying some dye and searching for a leak in the very near future. I appreciate all of the help and direction.