Just recently (this week) i noticed that the compressor in my Denali hasn't been turning on when i start the truck, when it used to everytime. No sagging, no heavy towing to begin with, just the occasional full load from my family piling in. Used to level everytime no matter what on start up. No trouble codes thrown. I bought the truck with 96K on the clock, it was extremely clean. Currently at 98K and just noticed this. I wash regularly, live in Iowa, salt but not a ton...any suggestions? diagnosis? where or what to check first?
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