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Q:

how do you replace a low side pressure switch for the ac on 2003 Chevrolet Silverado 3500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
would like a diagram of what it looks like
(1) Answer
First tell us why you think it needs to be replaced, since you don't know what it looks like. This is a pretty reliable part. Wire connections is most of the problems i see. Might help more if you tell us a bit more! Just tring to help you FIX the problem.