I have a 94 D90 with a cracked air con housing that drips water onto the passenger floor. It is not a blocked or wrongly routed pipe. Diavia tells me all the housings are the same can anyone confirm this as they are expensive.
I can't confirm this, but why not just patch the housing from the inside - you wouldn't see the work from the outside. The housing is easy to remove (and you have to do this anyway if replacing it, so no harm pulling it to check it out).