I've been dealing with the chunks of gray foam and debris blowing out of my vents for about 6 months now. I don't have an issue with my air temperatures, they are fine. It's just a PITA when I get my car detailed. I just took it to my expert VW mechanic yesterday and he said it would cost $1800 to fix it. The heater core needs to be replaced, or for $1100 they can pull the heater core and re-foam it. Are there any cheaper options? Thanks.