A/C in cat 308D not working

I have a cat 308D and i cant seem to get the A/C cold air to blow through the vents. There appears to be condensation and very cold to touch at a refrigeration line/block under the seat. When the A/C kicks in after pressing the on button the temperature lights on the A/C console light flash and i cant change the temperature as well as the vent light and i cant change vent settings. Any ideas??
Also where can i get my hands on a workshop manual that i don't have to remortgage my house for??...

A/C in cat 308D not working

A/C in cat 308D not working