Where do you put refrigerant in a 1998 buick regal?

The refrigerant is added to the low-side service port on a 1998 Buick Regal's air conditioning system. This port is usually located on the drier/accumulator (a cylindrical component) or a nearby line. It's typically a larger diameter port than the high-side port and will be capped with a cap that is usually blue.

However, I strongly advise against attempting to add refrigerant yourself. Adding refrigerant improperly can be dangerous and damage your AC system further. Refrigerant also requires special handling and tools.

Instead, take your Buick Regal to a qualified mechanic or AC specialist. They have the proper tools, knowledge, and safety equipment to diagnose and repair your AC system correctly, ensuring safe and efficient operation. They can identify the actual problem (a leak, compressor failure, etc.) and fix it, not just add refrigerant as a temporary fix which may worsen the situation.