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Message: <blockquote data-quote="jfmorris" data-source="post: 27026" data-attributes="member: 13408">This is interesting, as my 2006 Silverado WT has THE EXACT same lights out and #4 speed on the fan has not worked since I bought the truck in 2014.  The speed issue is likely the blower speed control module (what used to be the resistor pack), as once or twice over the years I have seen speed 4 work intermittently.On my 1996 C1500, it uses socketed light bulbs for all the dash lighting, but I think on 2003-2006 models, all the bulbs are soldered in, at least on the instrument cluster. I had fun replacing all the bulbs on the cluster for my 2003 Yukon a decade or so ago.  I suspect the same thing on the manual climate control.  Let me know what you find out...</blockquote>