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Low pressure test ports are near the receiver/dryer on most vehicles. If you can't find it near the firewall, check between the receiver/dryer and the compressor. A few vehicles don't have a low pressure test port. In that case, the system is tested by pulling the low pressure sensor, jumping it and connecting the gauges directly to the receiver/dryer. But check the entire length of the low pressure line before you do that.

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Q: Where is the ac vacuum check valve on a 2002 Jeep Wrangler?
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