I have finally gotten down to fixing the last rattles on my 991 after the Porsche workshop failed to remedy the problem - so I had a go.

Sorry - no pictures - when I get going, I get going. But it's simple and I have tried to describe it as best as possible. Holler if something is not clear.

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Fixing rear window rattles on the 991

One of the most common sources of rattles on the 991 are the rear windows. The windows are mounted in a floating frame held onto the body with a plastic tab on the rear end (the narrow part of the glass), a similar tab on the top (about the middle of the glass) and two nuts which hold the two window adjusters which are located top and bottom on the front side of the glass at the B pillar.

There are two sources of rattles - the first is the contact area of the bottom frame to the body work. Nothing holds this in place so it can
move freely resulting in possible squeeks and rattles when driving over rough surfaces.

The second source relates to the top of the window and the plastic peg. The glass may be slightly loose in the frame here - and that does not
help.

To identify if you have a rattle simply work your way into the rear seats and tap the glass from the inside firmly with your finger and listen
to the sound. If all you are getting is a thump then you don't have an issue here. If you get a "thump" followed by a "krr" everytime your
finger bangs the glass then it's time to do some work. Do this at various places over the glass - you'll get the hang quickly.

It's fairly easy to perform the fix. You need only very basic tools. You need to find a 1/2 inch wide stip of very thin double sided tape (not
much more than the thickness of a sheet of paper. I found some nice stuff in an art shop). The length of the strip is about 3/4 the length of
the rear window you want to fix. You may also need a piece of rubber fuel hose (the stuff sold in spares shops). About an inch is what you are
looking for.

The double sided tape goes between the bottom of the rear window frame and the body work. For this the window has to come out just a little bit
so you can place the tape. This is simple:
Remove the plastic trim piece where the seat belt goes in (B-Pillar). Simply pull it out - it just clips in. Now remove the B-Pillar trim - again, just pull it out towards you (right angles to the pillar) - it just clips into place. You now see two nuts (one is hidden by the seat belt). These hold the window adjusters in place. Remove the nuts. Don't turn the adjusters (you need to stick an allan key into them to turn them if needed).

Now lightly push the rear window at the bottom outwards and it comes out about 1-2 inches (the top of the window remains in place). Stick a bunched up cloth into the gap to hold the window open like that.

Now take the opportunety and clean the underside of the window frame and the exposed body work so your double sided tape will stick better.
Place the tape on the underside of the exposed window frame as far back as you can get it in - don't worry if you can't get the tape all the way
to the rear part of the frame (that is still connected at the back so it gets tight there).

Once the tape is ready remove the cloth and place the window back - there is a small locating pin at the bottom of the window at the B-Pillar. During this
manouver push the frame up so the double sided tape does not stick prematurely onto the body while you are still moving the frame.
Once back in place, put the two nuts back while applying downwards pressure into the frame from the outside to help the double sided tape bond.

If all is well the frame will now no longer move when you push outwards on the glass from the inside.
(Side note: You could also consider a thin bead of clear slicon instead of the tape, don't use too much in case the frame ever needs to come out).

Note the B-Pillar trim has 4 metal clips. Take some lithium grease (or thick silicon grease) and apply a good bit on each. This will prevent the
clips from vibrating if they aren't completely tight (they seldom are). Now clip the trim pieces back into place.

Repeat the tapping. All good ? Concentrate on the top part of the window now. If you hear a bit of "Krr" there it's time to use the fuel line.
Feel with your fingers around the top of the window behind the roof liner (there is quite a gap there and the roof liner is flexible). At around the middle of the frame you should be able to feel the small plastic pin that holds the top of the glass in place. That is about where you are going to simply force in the piece of rubber fuel line. Note there is a fairly wide gap between the glass and the body work - all along the top.
The rubber fuel line fits in nicely with just the right force and it applies permanent pressure to the glass pressing it against the frame so
there is no chance of a rattle here.
(Side note: You can also consider stuffing a length of foam into the gap)

Good so far ?
Now get moving on the other side of the car...

 

Impressive. Excellent work. If you have pictures, please post. I don't have rattles from my rear window (currently at 1400 miles), but I will bookmark this in case it comes up in the future.

 

First of all, thumbs up to OP for making DIY fix for the rear window rattles.
Attached are official removal/installing steps with pics, hope it helps.

 

Anyone come up with a fix for the driver side door rattles? I think it's in the door handle and/or the 1,2,3 seat position switches. Needs better damping around these light plasti-metal pieces. Looks great, but the rattling is not cool.

 

Thanks for those. That should help. Must remember to have the camera handy next time I attack my car with a screwdriver !

Anyway, to recap, I have the SPASM so rattles are naturaly much more likely as the suspension is quite a bit more firm compared to the normal models. I have just the right road nearby to test my progress so after having fixed the major annoyances I now put the dampers on "sport" and let rip. There was still one minor issue on the passenger side door - just a minor "krr" everytime there is a bump in the road.

Turns out this one was easy to fix. Tapping of the (rather cheap) plastic trim pieces revealed that the one under the door handle is not seating properly - there is just no force on the tabs that holds it in place so the whole thing rattles at the slightest provocation.

Lifting the handle allows easy removal - just lift it out from one corner. I stuck a few bits of self adhesive foam onto the backsides including the tabs themselves. Also carefully bent the tabs after heating the plastic with a hair dryer so they now stick into their holes with a decent force.

Another one fixed. It's getting quite good now.

Porsche certainly CAN do it - if I take my newly aquired Panamera over the same road there are no rattles at all (well, there are also no bumps - somehow they are just not there when the pana cruises over them).

Rainier

 

May I ask where you got these great documents from ?
Second question: Got any more of them ?

Thanks again

Rainier

 

Got it from 'a friend' for my reference to fix that rear window rattles, just couldn't find the time to do it yet. Your DIY will surely come handy and seems faster too.
Other doc I have is stone guard film install/removal > thinking of replacing them with black.

 

Thanks again,
yes, it's faster as there is no need to remove the roof moulding (and take the entire rear window out). You can do the whole thing in less than 30 minutes working slowly...

Nice "friend" to have. Local Porsche shop has been helpful though with answering questions, can't complain on that front...

Rainier