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Error code 84 on a 1999 Cadillac Seville STS typically indicates an issue with the vehicle's air conditioning system, specifically related to the refrigerant pressure. This code can signal low refrigerant levels or a potential problem with the A/C pressure sensor. It's advisable to have the system inspected for leaks or component failures to address the issue properly. Always consult a professional mechanic for accurate diagnosis and repair.

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