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To add R134a to a 2002 Saturn SL, first ensure the engine is off and the AC is set to the maximum cool setting. Locate the low-pressure service port, which is typically near the AC compressor; it has a larger diameter than the high-pressure port. Attach the R134a refrigerant can to the low-pressure port, following the manufacturer's instructions, and open the can while the engine is running and the AC is on to allow the refrigerant to flow into the system. Monitor the pressure and avoid overfilling, as this can damage the AC system.

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2w ago

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