This may sound like a silly question, but are the climate control knobs in the 98 ML320 supposed to light up? Every other dash light works, but these don't so I was wondering. If yes, is it a major job to replace the bulb? If so, I might just leave it dark. Thanks for your help.

Yeah they light up. You can get to the bulbs just by pulling off the knobs, I think the right and left ones, not sure. Not hard to do.
Gilly

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Good timing on this post. My lights have started to act up also. Sometimes they are on, other times they come on when you change a setting, or times they don't come on at all. Something loose?

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Litton
'90 420 SEL (sold)
'72 280 SEL 4.5
'98 ML320 (for sale)
'86 560SL
'05 Jeep Grand Cherokee Ltd (offroad in style)
'87 Chevy Blazer (AZ Pin Strips)