That's pretty awesome. My e53 doesn't have heated seats, but my e32 does, and the bottom on the driver's side doesn't work. I'll have to give this a go. Thanks for taking the time to write it up!

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2001 X5 Sport 3.0/5-speed
1998 318ti/5-speed
1988 735i/5-speed
1984 528e/5-speed (soon to be M20B25-powered 525i!)