fan switch on 2005 Chevrolet Silverado 1500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
switch only works on positions #1 & 2 . It worked it way down the scale untile now it only works at 1 & 2 .Could it be the switch control its self .
(2) Answers
Yes it could be a faulty switch causing the problem. That's the first thing I'd check.
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