Having done both, I can say that the difference is purely for sound. Doing the door with the hvac tape, you will hear a tinny *thud* when any of the doors goes all the way open or closed from the door hitting the side of the box. But you do have to listen for it. If you use the felt/foam, you get a quieter operation from the doors. So far, both have held up fine, even after doing them 10+ years ago (in mk2s, anyway).So, some people used solid tape, like for hvac...the aluminum type, and they shut out the outside smells, engine smells, and got very hot heater and very cold a/c results?
Why bother with the adhesive felt or foam, then?
Is this the same for the NB? 2000 has been blowing foam bits for a year now, A/C is meh, nearly no heat except on recirculate, so this needs doing. What I'm seeing are all Jetta or Golf models in the pictures and descriptions, and haven't looked at Bentley yet. The 2000 needs some love put into it, it's been the workhorse for a long time, but sits a lot more now that there are others newer around.
EDIT: Found a youtube video showing the procedure, looks similar enough to proceed cautiously.
What did you get at Home Depot? Just the a/c tape or did you find foam there too?
For the foam piece you replaced, where did you get it?There are plenty of good discussions on foam vs aluminum duct tape, so I will not go into that, but I did want to highlight one part of the rear damper door that I nearly missed. See the boxed area in the photo below.
For the foam piece you replaced, where did you get it?
If VW do you have the part# handy.
I may be doing this in the future.
It looks like you are not removing the back of the case so you did not drain the coolant or evacuate the AC?
About how many hours do you have into it so far?
Most of the MKIVs came off the assembly line in Mexico- I'd suggest there are no quality differences between those and the cars from Germany (some have argued the Puebla vehicles are better). I'd also say that most cars have their gremlins, they just vary by make. I certainly don't drive VWs based on claims of reliability (although the MKIV ALH is incredibly reliable). As for your blend doors, how long did they go without problems? 15 years? That's not bad. I'd replace the foam and use it as an opportunity to combo some other projects.I know it's paid for but, dang, I'm sick of these little grimlins that seem to plague the VW brand. Don't get me wrong....I love the little bugger but the engineering or certain systems is rather questionable. I know the original bugs were manufactured in Germany, but, the new bettles are coming out of Mexico correct?