The climate control pushbutton module should pull out with the radio pulling tools. I have never needed to replace the bulb in my car, but I remember when my dad had the car he had the dealer change it once and I think it was like $35, so its probably not that hard to do but I could be wrong.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record