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Typically there will be 8 of them. 1 on each tire, including the spare. 1 on the fuel pressure test port, 1 on the high side AC and 1 on the low side AC. If you're wanting to charge the AC, most GM vehicle low side AC ports are near the firewall, on the passenger side, but that's not always the case. one foolproof way, follow the AC lines from the compressor. one of the lines will go to the condenser (behind the radiator). The OTHER line is the low pressure line. Follow that one back until you find the test port.

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