I just bought a Starmarked 1998 E300D TurboDiesel and within a month or so, the driver's side seat started the clicking or snapping sound when I stopped or started up. I complained and I was told the car seat fasteners were redesigned and a new fitted set of bolts would be needed, and that they would be replaced under warranty. This was done and the problem was not fixed so the dealer ordered a new seat frame. When the seat frame came in, it also did not fix the problem. It turned out the electric seat adjustment mechanism gears were worn and had to be replaced. This was done and since then, no clicking or snapping noise from the driver's seat. But the passenger seat started making noise. It happened as soon as I started sitting in the passenger seat (I am 200lbs. vs. my wife who is 125lbs.) and now I will make an appointment to have that seat fixed. I certainly agree this is a defect of one sort or another, as I have never had a Mercedes seat do anything like this before and I have driven these cars many miles. I have no experience with this process so let me know what has to be done on my part to help get the problem fixed for all of us.
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)