AC DOES NOT WORK on 2001 Volkswagen Passat

Ok guys, I changed my heater core in the winter, I have not used the AC in a while may be last year, now I tried it, it is just blowing normal fan air, I try to put the Freon and the gauge says it has pressure to the max, I drained some out and some yellow like liquid was coming out, anyways I added some Freon and yet still not cold, what can I do, the shops I know here charge a lot...What can I do.?? Thanks.

2 answers
we know repair shop charge a lot but you need to properly diagnose the a/c system and get estimate.
the yellow liq was a/c oil, save time money and headaches and have it ck'd out. no job 4 novice