One of friends who owns a 2002 ML320 just had a major problem with their seat heater.The heater was getting so hot it started melting away the leather/carpet on the bottom of the backrest.They took it to the dealership and were charged $1000 to get it fixed.For the past few weeks,I have been noticing that my seat heater was getting very hot (2003 ML500) and I thought nothing of it.Is there anything I can do to fix this problem without spending the $1000,anyone else experience this?
-Thanks

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1998 S500
2006 E320 CDI
1963 220S
1994 S500
1995 S500
2005 BMW 545i sport
2007 GL320 CDI
2007 ML320 CDI
1991 Toyota Previa White over Blue
2000 Lexus RX300 White over Beige
2008 Audi Q7 Black Opal over Grey
1993 Toyota T-100 Silver over Grey
2002 Chevy 2500 Express White over Grey