Welcome to the infamous mercedes heated seats. You need a whole new seat cover for the bottom portion. Both the heated seats in our 97 C280 and 01 E320 has gone bad, and had to replace the entire leather covers. Its nice because the new leather and the old leather never match correctly. One is broken in and one is new. Seems mercedes just cant design a heated seat that lasts 1 to 2 years. bravo.

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93 300D 2.5 Turbo, Black/Palomino 273K
09 E350 Black/Black 41K