VN heater/vacuum problem :(

[vn_wagon90]

Hey all .. The wagon isnt felling to well at the moment .. The heater isnt working properly due to the vacuum ..

When i turn the heater knob it stays on cold .. But when i take the Vacum hose off the heater tap, the heater works .. Ok now why would the vac be sucking at the heater tap, all the time .. Its got me stuffed

 

[RiCeY]

Vacuum lines always have vacuum, Id say the issue is with the tap itself.

 

[FXST01]

Up by your left leg (when seated as driver) (under the dash) is a threaded rod which controls the heater settings, is it connected?