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Q:

fan switch on 2005 Chevrolet Silverado 1500

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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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https://repairpal.com/directory?address=36571&car_brand_names=Chevrolet