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Recharging & refrigerant (freon) for the auto A/C
Q: How do I find the charge ports on my A/C system?
A: Your auto A/C system includes 2 charge ports. One for the low side and one for the high side. The simple way to find them is to trace the lines. Usually, from the evaporator outlet, (near the firewall) follow the line to the A/C compressor. The LOW side port should be on this line. For systems using an accumulator, it may be one of the ports right on the accumulator. To locate the HIGH side port, locate the A/C compressor. Follow the line that goes to the condenser (usually the smaller of the two). The HIGH side port may be on the line between the compressor and the condenser OR it could be on the line after the condenser; between the condenser and the evaporator inlet. On R-134a systems, the HIGH side charge port will be larger than the LOW side port, and will require quick connect couplers to connect. If you are using an older set of R-12 gauges, don't worry! You can convert those gauges to work with R-134a! View an auto A/C system illustration to help you locate the charge ports.

 

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Our list of FAQ's is growing, so please visit back often. If you can't find the right answer here, visit the auto A/C help and discussion board at the COOL ZONE. You'll get all the right answers to your questions about troubleshooting and diagnosing auto A/C systems.

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