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I assume you are referring to the A/C. If so it should be on the passenger side of the engine. Don't no much about a Silverado of that year, but, the easiest way is to look for a blue cap. Red is high pressure and blue is the low side. Hope this helps. V/R SSG Sadosky Armymech/Fordtech

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15y ago
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Q: Where is the low-side port on a 1988 Chevy Silverado K1500?
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