I have the same problem in my picasso, if I put the aircon on its fine- have been told to check pollen filter and possible water forming in this area. Could be your problem alo
Nutienurse, December 2012
is it loseing water,if so check matrix.a good sign or should i say bad sign is carpet will be stained,damp.if it is a bad job to change like most are try rad seal
jimbo, February 2009
Have you got the heating control set on recirculation, instead of fresh air?
Are your car carpets damp?