To change the burnt-out bulb for the passenger temperature control on a 2003 GMC Envoy, start by removing the dashboard panel surrounding the climate controls. This typically involves unscrewing a few screws and gently prying off the panel. Once the panel is removed, locate the temperature control assembly and carefully detach it to access the bulb. Replace the burnt-out bulb with a new one, reassemble the controls, and reattach the dashboard panel.
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