No air coming through air vents

[Luke G]

I'm the owner of a 2004 clio. Nothing special just a first car. I got into it the other day and strangely the heating no longer works. All speeds seem to work and it sounds as if it is on however a strange, almost whining sound accompanies the usual flowing air sound and no air flow is coming through the vents no matter what speed or setting i put the heating control on. I have absolutely no idea what the problem is and cannot find anything on the internet that suggests what the problem is or how to fix it. Please help!

 

[barnesautos]

Check the pollen filter isn't blocked.