Where is the low side ac port on a 1993 Buick?

The location of the low-side AC port on a 1993 Buick will vary slightly depending on the specific model (e.g., Regal, LeSabre, Century, Roadmaster, etc.) and whether it has R12 or R134a refrigerant. However, it's almost always located on the drier or accumulator.

The drier/accumulator is typically found near the firewall, somewhere in the engine compartment's front area, often close to the compressor. The low-side port is usually smaller than the high-side port.

To be certain:

* Consult your vehicle's repair manual: This is the most reliable source. It will have diagrams showing the exact location of all AC components, including the ports.

* Look for a smaller service port: The low-side port is usually smaller than the high-side port, and often has a smaller cap.

* Use caution: AC systems operate under high pressure. Never attempt to service your AC system without proper training and equipment. If you are unsure, have a qualified technician perform the work.

Without knowing the exact model of your 1993 Buick, I cannot give a more precise location. Refer to your owner's manual or a repair manual for your specific vehicle.