Just wanted to post a pic of the drain hose on 2002 Doblo. ~
the symptoms are dripping water onto your feet inside the cab.

You need to lift bonnet, it is behind the battery on the wall to the cab.

It is a bent rubber hose with an eyelet that can get blocked with crud. Just squeeze it to clear it. Hope pics helps someone who was getting wet toes.

me, while cleaning out me van, first time in 2yrs, me floor was wet, have been using air con, will cheak this , been looking at door seals

right, found it, cheaked it, the end is kind off squashed together, and sealed itself up with muck, so got a 5 year old, picked him up by ankles, put him into engine bay and told him to squeeze the end of rubber bit, then gave kid back to mum and ran away, , went for a test drive, with A/C on, for 30mins, got back, cheaked pipe, now leaking water, fixed