Not sure what other do after driving their air cooled VW's in the rain, but thought I'd add a tip I do regularly on mine.
On a regular basis I will turn the heaters on full to dry out the heater channels. I make sure I do it after having been out in the rain, and at least once every 2-3 weeks. It's best to do it on a long trip so their on for ~20-30 minutes or more.
In summer I try to do it at night with the windows down so you don't get too hot also!
I don't know if it helps, but the theory is to getting them good and hot will help to keep the heater chanels nice and dry.
Cheers,
Richard
Andy ·