Help please - Air con High Pressure Switch F129 Vagcom

Hi all,

Basically my A/C does not work in my 2001 ( 51) octavia 110 1.9 diesel. I have been reading on the forums, and purchased vag com ( thanks guys ) now when I read the codes, I am getting a fault with A/C high pressure switch F129. Can anyone please confirm to me, where this switch is located, and anyway I can test it?? I have already chucked money at the A/C - paid to have it gassed :(.

Thanks

Jon