[juniorwatson]

is it ok to just buy the 134a in an autoparts store and just adding it in accumalotor till it is filled?

NO!!! There is no empty/full level with the A/C system

...well i did that and my a/c is blowing cold but not ice cold lol any ideas?

You can't just dump freon into the system without monitoring the high & low side pressures. You have no way of knowing whether you don't have enough freon in the system, or too much, or the correct amount without a set of gauges.

What is the temperature of air coming out of the RH center vent? What's the ambient temperature?

Check out the post that I put a lot of info into that is a sticky here:

http://www.impalassforum.com/vBulletin/showthread.php?t=244168