I just replaced my cabin filters, which were waaaay overdue. Everything went back just fine except the windshield gasket. It is on both grooves,but the top of the gasket doesn't seem to be as sealed as it was before. I saw on the peachparts guide to use 3m weatherstrip adhesive. Is it for this specific part? Is there a glue/adhesive i can use to keep that part sealed down but obviously still be able to be removed in the future when other repairs are required.

Is this what i should be using?
https://www.pelicanparts.com/More_Info/0019893120.htm?pn=001-989-31-20-MBZ&SVSVSI=W124&DID=57065

any advice on how to use it?

Thanks!

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I'm going to use some silicon glue to keep it held down. It should be waterproof and easy to remove for the future.

Let me know if anyone disagrees with this strategy.

You need to clean the metal groove that is right under the windshield with a toothbrush and soap, then fully flush it or wipe it clean.

In a similar fashion, you have to clean the gasket lip that catches in the groove channel under the glass.

To insert the gasket, you will need to apply some dishwash liquid to the groove, once you lay the rubber in the groove a gentle push will lock it in.

Hoping you have not smashed or broken that groove, you will then need to find it, I think its only sold in aftermarket now.

To insert the gasket, apply some dishwash soap to

The groove maybe metal or plastic, its been a while but the rest as explained is how I would seat the batwing in place after cabin filter change.

the groove is in pretty good conditions. A couple small bits have flaked off, but overal it seats the seal just fine. I can clean it out with dish soap and remove any dust/grime under the seal.. but it's not sticking. My local mechanic recommended some silicone glue as well, just to keep it down (very small amount). That way if i need to remove it.. it should be fairly easy to do so?

You think just adding some soap under it will create a seal?

The soap allows the rubber to slip past the locking area of the groove strip hence making the gasket sit in its full seated position and fully against the glass as well.

__________________
2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

have a look at this thread

95 e300d, moulding below windshield that windshield&wiper rubber seal snaps into?

One of our members here found it on jcwhitney - its the whole trim piece that attaches to the glass and allows that large lower molding to attach. This is the part Im mentioning to clean out with and use soap in its groove so the gasket can fit.

If yours is now missing entirely or is in poor shape. This would be needed.

__________________
2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

I do have that part currently, and it is mostly in tact. There are a few small gaps where the plastic has crumbled off but it is probably 95% there. The issue is not around that sealing part but the top flap of the rubber just doesn't seem to be as "sealed" as it was before i did the job.

Do you see any issues with using a small amount of silicone glue to keep the top part from curling up?

Also, can you still source the rubber gasket (even from the dealer or classic center?) Mine is in good shape, but i would also love to have another one as i could replace both of these together in the next year or 2.

I faced the exact same problem you faced when I first changed the cabin filters. No amount of work would get the gasket to sit flush on the glass.

Right uptil I cleaned the groove and use dishwash soap to aid the rubber seat into the groove. Otherwise it just sat proud of the glass.

For using sealant - if you silicone this, then forget any repair you will need to do like cabin filter or AC expansion valve.

__________________
2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

you used dishwasher soap on the seal or just the groove. Did you leave some on the glass to help it seal or completely clean it off first(clean it off the glass and the groove?)

ill give this a shot before i silicon glue it.

I put regular dawn dishwash soap on the groove where the seal is supposed to seat into, then just gentle thumb pressure seated the rubber into it.

Its a tongue and groove lock design.

No soap is required on the glass, once the rubber fully seats it contacts the glass pretty tight.