Astra x reg diesel astra estate?

Hello can anybody help me please.
The heater isnt working or the blowers,nothing coming through at all.I have flushed the system and still no joy,do i need any parts to fix it?if so where do i get it from and what isit called and where isit located?
Please help as its cold and my windows are getting steamed up,lol
Hope to hear from some kind person soon please.