Actually it's the temp. select wheel and fan control that don't light up. Now maybe they aren't supposed to, I don't know. My other Mercedes had the old Chrysler unit. Since I have owned this TD, these two controls never were lit up. If they are supposed to light up, is it easy to replace the bulbs?

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member