driver's side, coupe, that seems to be coming from my seatbelt retractor or somewhere in that area. Metallic sounding, I can't get it to stop by doing anything, any pressure or tension in any place....Somebody else experienced this? Driving me nuts!
Thanks...

 

I have it too. I thought it was the spring on the console pocket or something around there but I obviously haven't figured it out.

I seem to remember that pushing on the side airbag cover made it stop but I am not positive.

 

Let's see if you guys have the same problem as me. Mine is a 1999 996 C2.

I have a rattle somewhere in the back that seems to be either the seat belt or the rear seat belt area.

I took off the rear window rubber trim, which revealed the window mounting on the car body. There is a metal strip on the bottom edge of the window that holds the window to the body. The strip is like a "clamp" on the window and has some foam rubber lining.

When the car is driven and I am sitting in the back, the sound on mine comes from this foam/rubber lined "clamp" when the window is vibrating out of synch with the body of the car.

I wonder if it is the same for your car.

I lubricated the area with a interior rubber stop-squeal available from a car parts and accessory store. The sound is cut down by half, but it is still there on more uneven roads.

It would be best if the "clamp" can be opened and new fioam/rubber can be placed there, but I do not dare to damage the car. I am hoping that with time, the lubricant will penetrate farther into the foam rubber to bring down the noise.

Please look at these areas, and if it the same problem, let's see how we can help each other.

Good luck!

 

Rear centre brake light is a bit loose can make that noise. on inside housing.

 

Sunroof rattle try pushing up and see. Just a thought.

 

I fixed the sunroof rattle a few weeks ago. Push up and the sound disappears. I took the fluffy side of a long strip of velcro, stuck it on the underside of the sunroof hole, using it as a "padding" that the sunroof can rest on top of. Problem solved!

 

coming from the left rear pass/cargo area. I thought it was from the seatbelt retractor area. I put some pressure on the rear window and that didn't seem to faze it. I did puch upward on the sunroof, and thought that had it, but wasn't it. The car is such low miles and original, I hate to start taking things apart....

 

As i said the Knocking sound from left rear seat belt retractor area is rear centre brake light moving in housing....sounds crazy i know but Porsche knows the fix for this. They use packing and tighten the light housing from moving.
Rear window is more of a creak sound than knock. There is a spring around the rubber that can be adjusted. Roof problem is more of a rattle and thud sound when you drive road joins. That is from the deflector inside roof cavity vibrating. Porsche also has a fix for this....packing velcro tape. Have fun..

 

Pushing against the rear window is not enough to create an effect. Take out the rear window rubber and look for the "clamp" edge. Use your finger tips to "pry" the "clamp" from the window and see if the sound diminishes. For mine, the sound disappeared when I did this procedure for both windows. The anti-squeak solved my left side sound 100%, while the left still has 50% sound.

 

My rear window sound is a definite rattle, not creak, strangely enough. What is this spring around rubber you mentioned? is it the u-channel "clamp" that I've been talking about?

Thanks.

 

Not a spring as such, more so adjusting the tension of the rubber on the glass, by packing, thats what P told me anyway. The main problem that actually causes the knocking in the Lh rear window (or rh) is to do with the glass hitting the rivet/rivets on the inside base of the B pillar. The window glass apparently can move slightly in position with the flexing of the body and hits onto the rivet @ base of "B" pillar area causing the knocking sound. They fix is to usually take the glass out and either replace the rivet or grind it down a bit to give more clearance. They usually adjust the tension in the rubber first to avoid taking the window out.When that doesent work then glass out and do the rivet trick etc.Thats what they said they did on my 996 (some years back now). Ive had 997c2s and now 997t so some time has gone since then but my brothers 997 c2 had the same problem in the window and recently my turbo had that sound which was the centre rear b/light. The rear centre brake light also causes the same sound of knock in that left rear area. These problems are all associated to 996 and 997 series im told by P. I think its better if you have the problem fixed by P anyway, so long as you remind them of what it most likely is that way they shouldnt waste too much time on chasing the rattle so to keep repair price to a minimum. The noise is very annoying, that I do know.

 

Extremely helpful info! Thanks! I will go and investigate.

 

There is a TSB to update the rubber inserts below the rear quarter windows to a longer length. My car was still on the old rubber strips. After installing the updated part, the sound was gone on the Right Side. The Left Side still had the rattle.

I will check again on the 3rd brake light to see if it rattles.

If this is not the cause, then it must be the B-Pillar rivet. Is this rivet on the B-Pillar, on its lowest portion, facing out of the car, or facing into the car?

Can I jam into the slot more rubber to limit the window deflection?

 

You are definately best to leave this job to P imo. Its not something a novice should try to correct.... no offense intended. Im told they have to take the rear quarter glass completely out and grind off the rivet @ the base of the b pillar and/or replace the rivet with another type of fixing etc. They havent elaborated to me exactly but as it so happens my car is in at P tommorrow morning to have the front diff changed out under warranty and, that damn rattle creak has come back again and ive told them that.... another warranty issue. They told me last time they had a go at playing around with repositioning the LH 1/4 glass and packing the rubber etc and,....doing the centre brake light with packing etc...which did actually fix it for a week or two that if it came back they would then have to remove the glass and do the rivet around b pillar base trick. As the damn creak has now come back i imagine thats what they will do next as they are out of options and i am out of patience. Someone mentioned recently on another 6speed thread just bthe othyer day that the creak has something to do with a faulty weld on the rear inner body where it meets the engine bay at rear left side. I checked that today in the course of doing an exhaust change out and all my welds are perfect so it can really only be the rivet issue. I can let you know what they (P) find when they do the rivet fix (along with the diff). PM me amd i will let you know when i get my car back.

 

I have the same problem. I have taken my 06 997 to 2 dealers and 1 Porsche panel shop with no or little luck.
I still have a thud coming from the left rear side and a tapping/rattle which seems to be coming from the passenger seat belt area.
Has anyone had this problem repaired?