Help me figure out this A/C issue (video inside)

[Slow5.0]

Hello all,
My dad is having problems with his ’99 Contour LX, to be more precise with his A/C. It goes back to last summer when he was low on freon, so I used 2 of those bottles from Autozone to fill it, and it was blowing cold air for almost 2 weeks, and then every day less and less. We checked few things here and there (including A/C Cycle Switch) and finally gave up which helped in a bit since summer was pretty much gone.

Now this year we were thinking of trading his car for something newer and better but prices on these newer cars are enormous, even worse than last years, at least in our area, so he decided to change few minor parts and try to fix his A/C and keep it for atleast 1 to 2 more years.

I Bought 12oz High Mileage 134A freon from Walmart with 4oz Stop Leak with dye by ID 2 weeks ago, added it to the system, and no leaks at all, but still not blowing colr air like it should. Extended cycle time for a few seconds but that’s about it.
So this morning he took it to Firestone store to have them take a look at it, and they added 1/2lb of freon so they could check it & told him that he was low on Freon and cooling fan wasn’t working. Charged him $31.79 (saved 10 bucks with their coupon) for it and he was on his way.

After work I checked all fuses/relays and everything seems to be in order, even fan is kicking in, compressor as well, it’s blowing cold air a little bit, but not enough.
I recorded it with my digital camera with 320x240 resolution, since it only shoots up to 30 secs in higher resolution (640x480), and had no time to charge battery on my real camera, so hopefully you guys don’t mind crappy video.

http://www.erietuners.com/videos/MVI_2179.AVI

So let’s see what’s your opinion/suggestion…

Thanks in advance.