My prob is as above as it doesn't totally clear wit heater on full blast but was told today by a lad at work dat da prob was a filter under da plastic cover under windscreen wipers was clogged and get it changed. So when i came home from work took off wipers and took off da cover but no sign of a filter anywhere?? Wud really appreciate any info as is really annoying me.

you but i had that problem before, there should be a button on the dash that either circulates air from outside or circulates air already in the car, make sure its set to the one that circulates air from outside, cleared mine straight away. 