Hi Christine,
Exactly the same has happened to my 53 plate scenic. One minute working fine and not the next, no air flowing at all. Take the car to a halfords to see if a fuse has blown. Your fuse box is situated in the glove compartment in front of the passenger seat. I wasn't as lucky, they said all my fuses are ok. So car is going into garage tomorrow, just hope its not gonna cost me an arm and a leg this side of christmas. Will let you know what they say and how much they charged me.
HTH X
vicki, November 2010