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The heater-A/C control is back lighted by one or two small lamps [bulbs] mounted in a lamp-holder(s) inserted into the rear of the control assembly.
Normally, the holders insert into a hole, and are locked in place by turning 1/4 turn to the right [clockwise], and removed by turning 1/4 turn counterclockwise.
Depending on the amount of room behind the dash, and around the heater-A/C control assembly, you may be able to remove the holder [s] by reaching up behind the dash.
If there is not room for you to work, then you will have to remove the assembly from the dash panel to access the lamp-holder(s).
What else can I help you with?
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