Air Con Diagram Request

[Bill Button]

HI I am trying to fix a problem with my Air con, I have replaced the low pressure hose (at great expense) but the system is still leaking.Hissing sound coming from around the off side front wing,

 

Can any one provide some diagrams of the parts I'm worried that the garage is starting to rip me off

 

Thanks Bill

[chrispb123456]

http://www.vagcat.com/epc/cat/vw/SHA/2003/406/56/4042407/

[Bill Button]

Thanks Chris