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On a 2001 Mercury Grand Marquis, the low-pressure service port for the air conditioning system is located on the larger diameter aluminum line, typically near the accumulator or on the firewall side of the engine. It's usually covered by a plastic cap that can be removed for servicing. Make sure to identify it correctly, as there is also a high-pressure service port in the system. Always consult the vehicle's manual for specific details and safety precautions when servicing the A/C system.

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3d ago

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