I've been searching through threads trying to find out how these AC/Heating systems work. So far these links have been helpful:
http://www.automotiveforums.com/vbul...d.php?t=419903
http://www.imcool.com/articles/airco...acuum_line.php
http://www.autozone.com/az/cds/en_us...rInfoPages.htm
My issue is that I can't get air to fully switch to defrost. Also, seems to be hard to get the heat to fully shut off. Thinking I have a vacuum problem of some kind.