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I have a 320D and have finally managed to get rid of my seat creak/squeak after years of annoyance so hopefully it might help someone or worth a try if your vehicle suffers from the same creaking. Mine sounded like a metallic kind of creak, like a spring creaking. It happens if I pushed my lower back into the seat and no matter what position I put the seat in it would still do this annoying creak. I've tried everything from tightening nuts to trying to spray WD40 into the side parts of the seat, underneath and in the gap in the leather up inside the back of the seat but with no success. My car is a UK 320D Right Hand Drive with manual leather sports seats. This is my solution: Raise your seat as high as it will go and push it as far back as it will go. Then look under the front of your seat (kneeling down outside the car). Where the manual TILT control (not the height lever) lever is (front of seat) you will see it connects to a small spring. This spring has a little bit of thin black plastic wrapping around it. Mine had moved to the front so I checked my passenger seat (which doesn't creak) and that one had the plastic wrapper pushed to the back so I did the same to my driver spring wrapper and the noise has gone! There is also a metal rod that goes from just behind this spring across to the other side of the seat (still underneath the seat). This kind of moves a little so I just made sure it was in the same position as the other (passenger side) and again the metallic creak has finally gone!!! I've adjusted the seat and still no creaking! The funny thing was the creak always seems to have sounded like it was coming from the lower back area of the seat but it must've been coming from this little spring all along. As said before it's attached to the lever that operates the tilt. I've also cleared annoying sounds from my cabin heater/blower by removing the micro filter and spraying (tons) of WD40 into the heated (rusted nut looking part in the centre), this took a few goes but used to drive me nuts every time I braked it would sound like trapped leaves stuck in there spinning on certain fan speeds. The other major annoyance was door rattling, I spent years lubricating the rubber door seals with Gummi Pflege but only this year have realised it's not coming from the rubber seals but the felt/nature strip (not sure of its official name) which goes around the outer edge of the inside of the door (looks like black felt even closer to the edge of the doors than the rubber seals are) and after using Gummi Pflege on that they are now silent. Hope this helps someone as have been searching for years and finally have a squeak/creak free car!
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