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Old 01-12-2022, 05:07 PM   #1
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DIY: Repair HVAC Blend Doors using Plastic Plugs (i.e. fix for foam in air vents)

I was reading VW forums and noticed that the Golf/Jetta/Beetle/Passat have the same HVAC blend door foam issues that Porsches do. Some users have started using plastic plugs to block the holes in the blend doors. The size and number of those plugs looked very similar to the Porsche blend doors, so I ordered as set…and they fit!

I put together a quick video fo the installation process. Hopefully someone else finds this useful/helpful.
Porsche 911 Boxster Blend Door Repair Plugs (fix foam coming out of vents)

Video: https://youtu.be/ZiFFllCzlxc

DSP Blend Door Plugs

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Old 01-14-2022, 01:45 PM   #2
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Originally Posted by Carlton Bale View Post
I was reading VW forums and noticed that the Golf/Jetta/Beetle/Passat have the same HVAC blend door foam issues that Porsches do. Some users have started using plastic plugs to block the holes in the blend doors. The size and number of those plugs looked very similar to the Porsche blend doors, so I ordered as set…and they fit!

I put together a quick video fo the installation process. Hopefully someone else finds this useful/helpful.
Porsche 911 Boxster Blend Door Repair Plugs (fix foam coming out of vents)

Video: https://youtu.be/ZiFFllCzlxc

DSP Blend Door Plugs
Cool! If I ever need to open mine up again I'll do it!
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Old 01-17-2022, 07:38 AM   #3
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Those little plugs look like the way to go, well worth the cost. I've done that repair using fiberglass three times. The plugs would eliminate the mess and the curing time of fiberglass, saving about three hours on the whole project.
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Old 01-17-2022, 09:38 PM   #4
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Great video, thanks for posting!
I feel so old school for using duct tape...Luckily, we don't get too cold here in NW Florida.
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Old 01-18-2022, 04:34 AM   #5
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... I feel so old school for using duct tape. ...
It is an HVAC *duct*, so ...correct use of the tape.
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Old 01-18-2022, 04:59 PM   #6
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I think the high-temp duct tape will work just as well as the plugs.

I didn’t know about the fiberglass repair option. That does sound labor intensive, especially for someone like me who is terrible at fiberglass work.
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Old 01-19-2022, 12:03 PM   #7
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I think the high-temp duct tape will work just as well as the plugs.

I didn’t know about the fiberglass repair option. That does sound labor intensive, especially for someone like me who is terrible at fiberglass work.
I'm with you on that! It was hard enough getting the strips of aluminum tape in place, I couldn't imagine laying glass tape and brushing resin onto the bled doors using the shortcut method and not making a mess all over, and having the resin run down and possibly harden in places that would jam the doors. My hat's off to someone who can do that!
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Old 01-30-2022, 09:01 AM   #8
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Thank you for posting this information. I ordered my plugs and will install them before spring. I'm planning to use clear RTV sealant for a neater appearance. (I know it is unlikely that anyone else will ever see it.)
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Old 02-06-2022, 05:29 PM   #9
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Great video, thanks for posting!

I have a stupid question - why are there holes in these panels to start with?

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Old 02-07-2022, 04:23 AM   #10
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Great video, thanks for posting!

I have a stupid question - why are there holes in these panels to start with?
It's not a stupid question – that blend door is definitely a stupid design! My guess is that it was a cost reduction. The end result is about 1/3 less material.
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Old 02-08-2022, 06:17 PM   #11
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It's not a stupid question – that blend door is definitely a stupid design! My guess is that it was a cost reduction. The end result is about 1/3 less material.
It isless mate rial but I'd bet there's another 'engineering' reason as you wouldn't cut different shape holes just to save materials.
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Old 02-09-2022, 04:06 AM   #12
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There definitely is an engineering reason to cut different shaped holes: To remove as much material as possible and still maintain the structural integrity of the part. The size and placement of each size of hole is proportional to the size of each panel.

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