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On a 2002 Cadillac DeVille, the low pressure port for the air conditioning system is located on the accumulator, which is situated near the firewall on the passenger side of the engine compartment. It is typically a smaller port, marked with a blue cap, and is used for adding refrigerant to the system. Always ensure the engine is off and the system is not under pressure before attempting to locate or use the port.

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1d ago

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